Used test: Audi A7 vs BMW 6 Series GT vs Mercedes CLS

A used Mercedes CLS is a highly desirable four-door coupé, but is it a better second-hand buy than its German rivals?...

New Audi A7 Sportback & Mercedes-Benz CLS vs BMW 6 Series GT

Our verdict

This market usually values style over practicality; we know that. But we don’t dish out points for looks; that’s for you to decide. We do, however, accept that the 6 GT looks kooky to many people.

But even if you were to ignore space and practicality completely, the 6 GT still racks up the most stars, including in key areas such as infotainment, costs and equipment. Factor in the huge boot and lounge-like rear seating and it simply wins by a bigger margin.

If the 6 GT still isn’t for you (and we’d understand why), the A7 is your best bet, due in part to its exquisitely made interior and superb long-distance cruising credentials. The CLS is close behind, though, and thanks to its seriously impressive diesel engine, tidy handling and cocooning cockpit, it’s the most appealing for those looking for something a little sportier.

Read our review of the all-new BMW 6 Series GT here

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1st - BMW 6 Series GT

BMW 6 Series GT 630d

For Brilliant infotainment; cheap in this company; very practical; high-quality interior

Against Stodgy handling; divisive styling

What Car? says Four out of five stars


2nd - Audi A7 Sportback

Audi A7 Sportback 50 TDI

For Classy interior; smooth high-speed ride on optional air suspension; practical boot

Against Hesitant gearbox; so-so infotainment; poor rear space

What Car? says Three out of five stars


3rd - Mercedes CLS

Mercedes CLS 400d

For One of the best diesel engines in the world; enjoyable handling; eye-catching interior

Against Ride is firm and there’s road and suspension noise; cramped rear space

What Car? says Three out of five stars

Read the full used Mercedes CLS review here


BMW 6 Series GT 630d M Sport

Engine size 3.0-litre diesel

List price when new £56,140

Price today £28,500*

Power 261bhp @ 4000rpm

Torque 457lb ft @ 2000rpm

0-60mph 6.0sec

Top speed 155mph

Fuel economy 49.5mpg (WLTP combined)

CO2 emissions 150g/km


Audi A7 Sportback 50 TDI S Line

Engine size 3.0-litre diesel

List price when new £57,840

Price today £36,500*

Power 282bhp @ 3500-4000rpm

Torque 457lb ft @ 2250-3000rpm

0-60mph 6.1sec

Top speed 155mph

Fuel economy 48.7mpg (WLTP combined)

CO2 emissions 150g/km


Mercedes CLS 400d AMG Line

Engine size 3.0-litre diesel

List price when new £59,855

Price today £42,000*

Power 335bhp @ 4400rpm

Torque 516lb ft @ 1200-3200rpm

0-60mph 5.0sec

Top speed 155mph

Fuel economy 47.9mpg (WLTP combined)

CO2 emissions 156g/km

*Price today is based on a 2018 model with average mileage and full service history, correct at time of writing


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