Compare the2025 Mercedes C-Class SedanVS 2025 Hyundai Sonata

Safety
Engine
Fuel Economy and Range
Environmental Friendliness
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Chassis
Passenger Space
Cargo Capacity
Servicing Ease
Ergonomics

Safety

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The C-Class Sedan’s pre-crash front seatbelts will tighten automatically in the event the vehicle detects an impending crash, improving protection against injury significantly. The Sonata doesn’t offer pre-crash pretensioners.

The C-Class Sedan has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The Sonata doesn’t offer front seat center airbags.

The C-Class Sedan has a standard Post Collision Brake, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Sonata doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

Over 200 people are killed each year when backed over by motor vehicles. The C-Class Sedan offers an optional Maneuvering Brake Function that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The Sonata doesn’t offer automatic braking for stationary objects directly to the rear.

Earlier warning of stopped traffic, traffic signals, dangerous road conditions, weather, or accidents, can keep driver's safer and prevent crashes. The C-Class Sedan offers optional Car-to-X Communication, a system that seamlessly communicates important warnings to the driver about impending danger, if they're available. The Sonata doesn’t offer a system that can receive automated systems from infrastructure or other vehicles.

The C-Class Sedan offers an optional Surround View System to allow the driver to see objects all around the vehicle on a screen. The Sonata only offers a rear monitor.

Both the C-Class Sedan and the Sonata have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors, available all wheel drive and lane departure warning systems.

Engine

The C-Class Sedan’s 2.0 turbo 4-cylinder hybrid produces 64 more horsepower (255 vs. 191) and 114 lbs.-ft. more torque (295 vs. 181) than the Sonata’s standard 2.5 DOHC 4-cylinder.

As tested in Consumer Reports the Mercedes C-Class Sedan is faster than the Hyundai Sonata 4 cyl.:

	C-Class Sedan	Sonata
Zero to 30 MPH	2.8 sec	2.9 sec
Zero to 60 MPH	6.7 sec	7.5 sec
45 to 65 MPH Passing	4.3 sec	5.2 sec
Quarter Mile	15.2 sec	15.8 sec
Speed in 1/4 Mile	96 MPH	93 MPH

Fuel Economy and Range

On the EPA test cycle the C 300 Sedan RWD gets better fuel mileage than the Sonata N Line 2.5 turbo 4-cylinder FWD (25 city/35 hwy vs. 23 city/32 hwy).

Regenerative brakes improve the C-Class Sedan’s fuel efficiency by converting inertia back into energy instead of wasting it. The Sonata doesn’t offer a regenerative braking system.

The C-Class Sedan has 1.5 gallons more fuel capacity than the Sonata (17.4 vs. 15.9 gallons), for longer range between fill-ups.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Mercedes C-Class Sedan higher (7 out of 10) than the Hyundai Sonata (4 to 6). This means the C-Class Sedan produces up to 13.2 pounds less smog-producing pollutants than the Sonata every 15,000 miles.

Transmission

A nine-speed automatic is standard on the Mercedes C-Class Sedan, for better acceleration and lower engine speed on the highway. Only an eight-speed automatic is available for the Sonata.

Brakes and Stopping

For better stopping power the C-Class Sedan’s standard brake rotors are larger than those on the Sonata:

	C-Class Sedan	Sonata
Front Rotors	13 inches	12 inches
Rear Rotors	11.8 inches	11.2 inches

The C-Class Sedan’s standard front and rear disc brakes are vented to help dissipate heat for shorter stops with less fading. The rear discs on the Sonata are solid, not vented.

Tires and Wheels

For better traction, the C-Class Sedan has larger standard tires than the Sonata (F:225/45R18 & R:245/40R18 vs. 205/65R16).

The C-Class Sedan’s standard 225/45R18 front and 245/40R18 rear tires provide better handling because they have a lower 45 series front and 40 series rear profile (height to width ratio) that provides a stiffer sidewall than the Sonata SE’s standard 65 series tires. The C-Class Sedan’s optional 255/35R19 rear tires have a lower 35 series profile than the Sonata N Line’s 40 series tires.

For better ride, handling and brake cooling the C-Class Sedan has standard 18-inch wheels. Smaller 16-inch wheels are standard on the Sonata SE.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires available on the C-Class Sedan can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The Sonata doesn’t offer run-flat tires.

Suspension and Handling

The C-Class Sedan’s drift compensation steering can automatically compensate for road conditions which would cause the vehicle to drift from side to side, helping the driver to keep the vehicle straight more easily. The Sonata doesn’t offer drift compensation steering.

Chassis

The C-Class Sedan is 6.3 inches shorter than the Sonata, making the C-Class Sedan easier to handle, maneuver and park in tight spaces.

The design of the Mercedes C-Class Sedan amounts to more than styling. The C-Class Sedan has an aerodynamic coefficient of drag of .24 Cd. That is lower than the Sonata (.27) and many sports cars. A more efficient exterior helps keep the interior quieter and helps the C-Class Sedan get better fuel mileage.

Passenger Space

The C-Class Sedan has 3.5 inches more front hip room, 1.2 inches more rear legroom and 3.7 inches more rear hip room than the Sonata.

Cargo Capacity

Pressing a switch automatically lowers the C-Class Sedan’s rear seats, to make changing between passengers and cargo easier. The Sonata doesn’t offer automatic folding seats.

With its sedan body style, valet key, locking rear seatbacks and remote trunk release lockout, the C-Class offers cargo security. The Sonata’s non-lockable remote release defeats cargo security.

A standard locking glovebox (which can’t be accessed with the valet key) keeps your small valuables safer in the C-Class Sedan. The Sonata doesn’t offer locking storage for small valuables.

To make loading and unloading groceries and cargo easier, especially for short adults, the C-Class Sedan has a standard power trunk, which opens and closes automatically by pressing a button or just by kicking your foot under the back bumper, completely leaving your hands free. The Sonata doesn’t offer a power trunk, so its trunk has to be closed manually.

Servicing Ease

The engine in the C-Class Sedan is mounted longitudinally (North-South), instead of sideways, as in the Sonata. This makes it easier to service and maintain, because the accessory belts are in front.

Ergonomics

The C-Class Sedan has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The Sonata doesn’t offer a remote starting system.

When three different drivers share the C-Class Sedan, the memory system makes it convenient for all three. Each setting activates different, customized memories for the driver and front passenger’s seat positions, steering wheel position and outside mirror angle. The Sonata doesn’t offer a memory system.

The C-Class Sedan’s standard easy entry and exit feature raises the steering wheel and glides the driver’s seat back, making it easier for the driver to get in and out. The Sonata doesn’t offer an easy entry system.

The C-Class Sedan offers an optional heads-up display that projects speed and navigation instruction readouts in front of the driver’s line of sight, allowing drivers to view information without diverting their eyes from the road. The Sonata doesn’t offer a heads-up display.

The C-Class Sedan’s front and rear power windows all open or close fully with one touch of the switches, making it more convenient at drive-up windows and toll booths, or when talking with someone outside the car. The Sonata’s standard passenger windows don’t open or close automatically. With the Sonata SEL/N Line’s power windows, only the front windows open or close automatically.

If the windows are left open on the C-Class Sedan the driver can close them all at the outside door handle or from a distance using the remote. On a hot day the driver can lower the windows from a distance using the keyless remote. The driver of the Sonata can only close the windows from inside the vehicle, with the ignition on.

The C-Class Sedan’s standard Keyless-Go allow you to unlock the doors from any outside door handle, open the trunk, and start the engine, all without removing the key from the pocket or purse. Proximity Key standard on the Sonata doesn’t offer a sensor on the rear doors, so you’ll have to reach a front handle to unlock the rear door.

The C-Class Sedan’s rain-sensitive wipers adjust their speed and turn on and off automatically based on the amount of rainfall on the windshield. This allows the driver to concentrate on driving without constantly adjusting the wipers. The Sonata’s intermittent wipers change speed with vehicle speed, but can’t turn on and off or change speed based on changing rainfall.

Heated windshield washer nozzles are optional on the C-Class Sedan to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The Sonata doesn’t offer heated windshield washer nozzles.

Consumer Reports rated the C-Class Sedan’s headlight performance “Excellent,” a higher rating than the Sonata’s headlights, which were rated “Fair.”

To help drivers avoid possible obstacles, the C-Class Sedan offers optional cornering lights to illuminate around corners when the turn signals are activated. The Sonata doesn’t offer cornering lights. The C-Class Sedan also offers optional adaptive headlights to illuminate around corners automatically by reading vehicle speed and steering wheel angle.

A power rear sunshade and manual rear side window sunshades are standard in the C-Class Sedan to help block heat and glare for the rear passengers. The Sonata doesn’t offer a rear or rear side window sunshades.

The C-Class Sedan’s standard outside mirrors include heating elements to clear off the mirrors for better visibility. Hyundai only offers heated mirrors on the Sonata SEL/N Line.

When the C-Class Sedan is put in reverse, the passenger rearview mirror tilts from its original position. This gives the driver a better view of the curb during parallel parking maneuvers. Shifting out of reverse puts the mirror into its original position. The Sonata’s mirror doesn’t automatically adjust for backing.

The C-Class Sedan’s standard rear and side view mirrors have an automatic dimming feature. These mirrors can be set to automatically darken quickly when headlights shine on them, keeping following vehicles from blinding or distracting the driver. The Sonata offers an automatic rear view mirror, but its side mirrors don’t dim.

Both the Mercedes C-Class Sedan and Hyundai Sonata offer exterior mirrors that can be folded to provide convenience. The C-Class Sedan features standard power folding mirrors, which allow for easy, one-touch folding or unfolding at the driver’s discretion. This provides added convenience when maneuvering or parking, as well as when walking past the parked vehicle. In comparison, the Sonata’s foldable mirrors are manual, requiring the driver to get out and physically fold them once parked and unfold them before getting in.

Optional air-conditioned seats in the C-Class Sedan keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Sonata doesn’t offer air-conditioned seats.

On extremely cold winter days, the C-Class Sedan’s optional heated steering wheel provides comfort, allowing the driver to steer safely and comfortably before the car heater warms up. The Sonata doesn’t offer a heated steering wheel.

The C-Class Sedan has a standard dual zone air conditioning allows the driver and front passenger to choose two completely different temperatures so people with different temperature preferences won’t have to compromise. This makes both the driver and front passenger as comfortable as possible. Dual zone air conditioning is only available on the Sonata SEL/N Line.

Both the C-Class Sedan and the Sonata offer rear vents. For greater rear passenger comfort, the C-Class Sedan has standard rear air conditioning vents to keep rear occupants cool in summer or warm in winter. The Sonata doesn’t offer rear air conditioning vents, only heat vents.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Mercedes C-Class has a standard wireless phone charging system (Qi) in the center console. Wireless charging costs extra on the Sonata and isn’t available on the Sonata SE.

The C-Class Sedan has a 115-volt a/c outlet on the center console, allowing you to recharge a laptop or run small household appliances without special adapters that can break or get misplaced. The Sonata doesn’t offer a house-current electrical outlet.

The C-Class Sedan’s Active Parking Assist can parallel park or back into a parking spot by itself, stopping and changing direction automatically. The Sonata doesn’t offer an automated parking system.