Compare the2023 Kia K5VS 2022 Mercedes A-Class

For enhanced safety, the front seat shoulder belts of the Kia K5 are height-adjustable to accommodate a wide variety of driver and passenger heights. A better fit can prevent injuries and the increased comfort also encourages passengers to buckle up. The Mercedes A-Class doesn’t offer height-adjustable seat belts.

Both the K5 and A-Class have child safety locks to prevent children from opening the rear doors. The K5 EX/GT offers optional power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The A-Class’ child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.

In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the K5 are reminded to check the back seat if they opened the rear door before starting out. The A-Class doesn’t offer a back seat reminder.

Over 200 people are killed each year when backed over by motor vehicles. The K5 EX/GT offers optional Parking Collision Assist that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The A-Class doesn’t offer backup collision prevention brakes.

The K5’s standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. A lane departure warning system costs extra on the A-Class.

To help make backing out of a parking space safer, the K5’s standard rear cross-path warning system uses sensors in the rear bumper to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The A-Class doesn’t offer a cross-path warning system.

Both the K5 and the A-Class have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, front wheel drive, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, blind spot warning systems, rearview cameras, driver alert monitors, available all wheel drive and around view monitors.

For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard vehicle-to-vehicle front crash prevention system, its standard vehicle-to-pedestrian front crash prevention system, and its standard headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the K5 its highest rating: “Top Safety Pick Plus” for 2022, a rating granted to only 81 vehicles tested by the IIHS. The A-Class has not been tested, yet.

The K5 comes with a full 5-year/60,000-mile basic warranty, which covers the entire car and includes 24-hour roadside assistance. The A-Class’ 4-year/50,000-mile basic warranty expires 1 year or 10,000 miles sooner.

Kia’s powertrain warranty covers the K5 6 years and 50,000 miles longer than Mercedes covers the A-Class. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 10 years or 100,000 miles. Coverage on the A-Class ends after only 4 years or 50,000 miles.

There are over 2 times as many Kia dealers as there are Mercedes dealers, which makes it much easier should you ever need service under the K5’s warranty.

A reliable vehicle saves its owner time, money and trouble. Nobody wants to be stranded or have to be without a vehicle while it’s being repaired. Consumer Reports rates the K5’s reliability 15 points higher than the A-Class.

J.D. Power and Associates’ 2022 Initial Quality Study of new car owners surveyed provide the statistics that show that Kia vehicles are better in initial quality than Mercedes vehicles. J.D. Power ranks Kia fourth in initial quality, above the industry average. With 33 more problems per 100 vehicles, Mercedes is ranked 19th, below the industry average.

J.D. Power and Associates’ 2022 survey of the owners of three-year-old vehicles provides the statistics that show that Kia vehicles are more reliable than Mercedes vehicles. J.D. Power ranks Kia first in reliability, above the industry average. With 50 more problems per 100 vehicles, Mercedes is ranked 18th.

From surveys of all its subscribers, Consumer Reports’ January 2021 Auto Issue reports that Kia vehicles are more reliable than Mercedes vehicles. Consumer Reports ranks Kia 5 places higher in reliability than Mercedes.

The K5 GT 2.5T’s standard 2.5 turbo 4-cylinder produces 102 more horsepower (290 vs. 188) and 90 lbs.-ft. more torque (311 vs. 221) than the A-Class’ 2.0 turbo 4-cylinder.

As tested in Motor Trend the K5 GT 2.5T 2.5 turbo 4-cylinder is faster than the Mercedes A-Class:

On the EPA test cycle the K5 1.6T FWD gets better fuel mileage than the A 220 FWD (27 city/37 hwy vs. 24 city/35 hwy).

To lower fuel costs and make buying fuel easier, the Kia K5 uses regular unleaded gasoline. The A-Class requires premium, which can cost 20 to 55 cents more per gallon.

The K5 has 2.3 gallons more fuel capacity than the A-Class (15.8 vs. 13.5 gallons), for longer range between fill-ups.

An eight-speed automatic (SMG) is standard on the Kia K5, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the A-Class.

For better stopping power the K5 GT’s front brake rotors are larger than those on the A-Class:

The K5 stops shorter than the A-Class:

For better traction, the K5 GT’s tires are larger than the largest tires available on the A-Class (245/40R19 vs. 225/40R19).

The K5 has a standard space-saver spare tire so you can replace a flat tire and drive to have the flat repaired or replaced. A spare tire isn’t available on the A-Class; it requires you to depend on its run-flat tires, which limits mileage and speed before they are repaired. If a run-flat is damaged beyond repair by a road hazard your vehicle will have to be towed. Some tire options on the A-Class don’t have a run-flat feature, either.

For a smoother ride and more stable handling, the K5’s wheelbase is 4.8 inches longer than on the A-Class (112.2 inches vs. 107.4 inches).

For better handling and stability, the average track (width between the wheels) on the K5 is 2.1 inches wider in the front and 3.2 inches wider in the rear than the track on the A-Class.

Because it has more passenger and cargo room, the EPA rates the K5 a Large car, while the A-Class is rated a Compact.

The K5 has 12.3 cubic feet more passenger volume than the A-Class (105.3 vs. 93).

The K5 has 4.3 inches more front legroom, 2.9 inches more front shoulder room, .6 inches more rear headroom, 1.3 inches more rear legroom and 2.1 inches more rear shoulder room than the A-Class.

The K5 has a much larger trunk than the A-Class (16 vs. 8.6 cubic feet).

Consumer Reports rated the K5’s headlight performance “Good,” a higher rating than the A-Class’ headlights, which were rated “Poor.”

To shield the driver and front passenger’s vision over a larger portion of the windshield and side windows, the K5 has standard extendable sun visors. The A-Class doesn’t offer extendable visors.

Consumer Reports® recommends the Kia K5, based on reliability, safety and performance. The Mercedes A-Class isn't recommended.

J.D. Power and Associates rated the K5 first among midsize cars in owner reported satisfaction. This includes how well the vehicle performs and satisfies its owner’s expectations. The A-Class isn’t in the top three in its category.

The Kia K5/Optima outsold the Mercedes A-Class by over four to one during the 2021 model year.