Compare the2025 Audi S5 SportbackVS 2024 Infiniti Q50

Safety
Warranty
Engine
Fuel Economy and Range
Environmental Friendliness
Transmission
Brakes and Stopping
Tires and Wheels
Suspension and Handling
Cargo Capacity
Ergonomics
Model Availability
Economic Advantages
Recommendations

Safety

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For enhanced safety, the front and rear seat shoulder belts of the Audi S5 Sportback have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The Infiniti Q50 doesn’t offer pretensioners for its rear seat belts.

Both the S5 Sportback and Q50 have child safety locks to prevent children from opening the rear doors. The S5 Sportback has 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 Q50’s 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.

The Audi S5 Sportback has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags helps prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The Q50 doesn’t offer knee airbags.

The S5 Sportback’s standard pretensioning seatbelts also sense rear collisions and remove slack from the seatbelts to help protect the occupants from whiplash and other injuries. The Q50 doesn’t offer a whiplash protection system.

The S5 Sportback has a standard Secondary Collision Brake Assist, which automatically applies the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The Q50 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.

To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S5 Sportback. But it costs extra on the Q50.

When descending a steep, off-road slope, the S5 Sportback’s standard Hill Descent Control allows you to creep down safely. The Q50 doesn’t offer Hill Descent Control.

Both the S5 Sportback and the Q50 have standard driver and passenger frontal airbags, front side-impact airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, available blind spot warning systems, around view monitors and rear cross-path warning.

Warranty

The S5 Sportback’s corrosion warranty is 5 years longer than the Q50’s (12 vs. 7 years).

There are over 51 percent more Audi dealers than there are Infiniti dealers, which makes it much easier should you ever need service under the S5 Sportback’s warranty.

Engine

The S5 Sportback’s 3.0 turbo V6 produces 49 more horsepower (349 vs. 300) and 74 lbs.-ft. more torque (369 vs. 295) than the Q50’s standard 3.0 turbo V6. The S5 Sportback’s 3.0 turbo V6 produces 19 lbs.-ft. more torque (369 vs. 350) than the Q50 Red Sport 400’s standard 3.0 turbo V6.

As tested in Motor Trend the Audi S5 Sportback is faster than the Q50 Red Sport 400:

	S5 Sportback	Q50
Zero to 60 MPH	4.5 sec	4.9 sec
Quarter Mile	13.1 sec	13.4 sec
Speed in 1/4 Mile	106 MPH	105 MPH

Fuel Economy and Range

On the EPA test cycle the S5 Sportback gets better mileage than the Q50:

			MPG
S5 Sportback
	AWD	3.0 turbo V6	20 city/29 hwy
Q50
	RWD	Red Sport 400 3.0 turbo V6	20 city/26 hwy
	AWD	3.0 turbo V6	19 city/27 hwy
		Red Sport 400 3.0 turbo V6	19 city/26 hwy

Regenerative brakes improve the S5 Sportback’s fuel efficiency by converting inertia back into energy instead of wasting it. The Q50 doesn’t offer a regenerative braking system.

In heavy traffic or at stoplights the S5 Sportback’s engine automatically turns off when the vehicle is stopped, saving fuel and reducing pollution. The engine is automatically restarted when the driver gets ready to move again. If the conditions warrant or the driver wishes, the system can be manually disabled at any time for the duration of a trip. The Q50 doesn’t offer an automatic engine start/stop system.

To lower fuel costs and make buying fuel easier, the Audi S5 Sportback uses regular unleaded gasoline (premium recommended for maximum performance). The Q50 requires premium, which can cost on average about 84.9 cents more per gallon.

Environmental Friendliness

In its Green Vehicle Guide, the U.S. Environmental Protection Agency (EPA) rates the Audi S5 Sportback higher (4 out of 10) than the Infiniti Q50 (3). This means the S5 Sportback produces up to 11.3 pounds less smog-producing pollutants than the Q50 every 15,000 miles.

Transmission

An eight-speed automatic is standard on the Audi S5 Sportback, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the Q50.

Brakes and Stopping

For better stopping power the S5 Sportback’s standard brake rotors are larger than those on the Q50:

	S5 Sportback	Q50
Front Rotors	13.8 inches	12.6 inches
Rear Rotors	13 inches	12.1 inches

The S5 Sportback stops much shorter than the Q50:

	S5 Sportback	Q50
70 to 0 MPH	158 feet	165 feet	Car and Driver
60 to 0 MPH	105 feet	123 feet	Motor Trend

Tires and Wheels

For better traction, the S5 Sportback has larger standard tires than the Q50 (255/35R19 vs. 225/50R18). The S5 Sportback’s optional tires are larger than the largest tires available on the Q50 (265/30R20 vs. 245/40R19).

The S5 Sportback’s standard tires provide better handling because they have a lower 35 series profile (height to width ratio) that provides a stiffer sidewall than the Q50 Luxe’s standard 50 series tires. The S5 Sportback’s optional tires have a lower 30 series profile than the Q50 Red Sport 400’s 40 series front and 35 series rear tires.

For better ride, handling and brake cooling the S5 Sportback has standard 19-inch wheels. Smaller 18-inch wheels are standard on the Q50 Luxe. The S5 Sportback’s optional 20-inch wheels are larger than the 19-inch wheels on the Q50 Sensory/Red Sport 400 AWD.

The S5 Sportback 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 Q50; 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.

Suspension and Handling

The S5 Sportback has standard front and rear gas-charged shocks for better control over choppy roads. The Q50’s suspension doesn’t offer gas-charged shocks.

For better handling and stability, the track (width between the wheels) on the S5 Sportback is 2 inches wider in the front and .2 inches wider in the rear than the average track on the Q50.

The S5 Sportback Prestige handles at .95 G’s, while the Q50 Red Sport 400 pulls only .88 G’s of cornering force in a Car and Driver skidpad test.

The S5 Sportback Prestige executes Motor Trend’s “Figure Eight” maneuver quicker than the Q50 Red Sport 400 AWD (25 seconds @ .76 average G’s vs. 25.5 seconds @ .73 average G’s).

Cargo Capacity

To make loading and unloading groceries and cargo easier, especially for short adults, the S5 Sportback has a standard power liftgate, which opens and closes automatically by pressing a button, or optionally by just kicking your foot under the back bumper, completely leaving your hands free. The Q50 doesn’t offer a power trunk.

Ergonomics

The S5 Sportback Prestige has a standard heads-up display that projects speed, warning 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 Q50 doesn’t offer a heads-up display.

The S5 Sportback’s power parking brake sets with one touch and releases with one touch or automatically. The Q50’s parking brake has to be released manually.

The power windows standard on both the S5 Sportback and the Q50 have locks to prevent small children from operating them. When the lock on the S5 Sportback is engaged the driver can still operate all of the windows, for instance to close one opened by a child. The Q50 prevents the driver from operating the other windows just as it does the other passengers.

Heated windshield washer nozzles are standard on the S5 Sportback to prevent washer fluid and nozzles from freezing and help continue to keep the windshield clear in sub-freezing temperatures. The Q50 doesn’t offer heated windshield washer nozzles.

Laser headlights, standard on the S5 Sportback Prestige, produce their light by firing blue lasers through phosphorus, a process that uses one-half the power of the Q50’s LED headlights. Laser headlights can have double the range of LEDs with a much smaller surface area.

The Insurance Institute for Highway Safety (IIHS) conducts detailed tests on headlights for their range both straight ahead and in curves and to be certain they don’t exceed acceptable amounts of glare to oncoming drivers. The S5 Sportback’s available headlights were rated “Good” by the IIHS, while the Q50’s headlights are rated “Marginal.”

Both the S5 Sportback and the Q50 have standard heated front seats. The S5 Sportback Prestige also has standard heated rear seats to keep those passengers extremely comfortable in the winter. Heated rear seats aren’t available in the Q50.

Optional air-conditioned seats in the S5 Sportback Premium Plus/Prestige keep the driver and front passenger comfortable and take the sting out of hot seats in Summer. The Q50 doesn’t offer air-conditioned seats.

The S5 Sportback has standard massaging front seats in order to maximize comfort and eliminate fatigue on long trips. Massaging seats aren’t available in the Q50.

To quickly and conveniently keep personal devices charged without cables tangling and wearing out, the Audi S5 Premium Plus/Prestige has a standard wireless phone charging system (Qi) in the front center console. The Q50 doesn’t offer wireless personal charging.

The S5 Sportback Prestige’s Park Assist can parallel park or back into a parking spot by itself, with the driver only controlling speed with the brake pedal. The Q50 doesn’t offer an automated parking system.

Model Availability

The Audi S5 comes in coupe, convertible and four door hatchback bodystyles; the Infiniti Q50 isn’t available as a coupe or convertible.

Economic Advantages

The S5 Sportback will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the S5 Sportback will retain 54.47% to 55.05% of its original price after five years, while the Q50 only retains 45.32% to 45.77%.

Recommendations

The Audi A5/S5/RS 5 outsold the Infiniti Q50 by almost four to one during 2023.

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