There's not a bad choice in the Audi S7 and RS 7's competitive set, to be honest.
But we really do like these two for their unique style and their monstrous V-8 engines.
The Mercedes-AMG CLS63 S comes closest in terms of style and panache and its twin-turbo V-8 is just as thrilling as what you'll find in the Audis.
The BMW M6 Gran Coupe is a close facsimile, but ultimately isn't quite as entertaining to drive—something we admit with chagrin when it comes to some modern BMWs.
But don't count out the Cadillac CTS-V.
Perfected over three generations, Detroit's German-style hot-rod outdoes its immediate sedan rivals even if it doesn't have quite the sexy shape of the Audis.
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 2018 Audi S7Get Your Price |  2018 BMW M6Get Your Price |  2018 Cadillac CTS-VGet Your Price |  2018 Mercedes-Benz CLS ClassGet Your Price |
|---|---|---|---|
| Quick Specs | |||
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The Audi S7 and RS 7 are like habanero and ghost peppers—among the hottest cars you’ll find anywhere. |
The 2018 BMW M6 lineup loses its iconic coupe, but the four-door Gran Coupe was always the more compelling choice |
The 2018 Cadillac CTS-V scorches the earth, and leaves the E63 and RS7 with some burn marks. |
The 2018 Mercedes CLS hangs on to its lissome curves; it’s V-8 only this year. |
| MSRP From | |||
| $81,200 | $119,800 | $86,495 | $75,150 |
| Gas Mileage | |||
| 16 MPG City / 24 MPG Hwy | 14 MPG City / 20 MPG Hwy | 14 MPG City / 21 MPG Hwy | 16 MPG City / 26 MPG Hwy |
| Engine | |||
| Twin Turbo Premium Unleaded V-8 | Twin Turbo Premium Unleaded V-8 | Supercharged Gas V8 | Twin Turbo Premium Unleaded V-8 |
| EPA Class | |||
| Mid-Size Cars | Compact Cars | Mid-Size | Compact Cars |
| Style Name | |||
| 4.0 TFSI Premium Plus | Gran Coupe | 4-Door Sedan | CLS 550 Coupe |
| Drivetrain | |||
| All Wheel Drive | Rear Wheel Drive | Rear Wheel Drive | Rear Wheel Drive |
| Passenger Capacity | |||
| 4 | 5 | 5 | 4 |
| Passenger Doors | |||
| N/A | N/A | N/A | N/A |
| Body Style | |||
| quattro Sportback | Sedan | 4 Door Sedan | Sedan |
| Transmission | |||
| Auto-Shift Manual w/OD | Auto-Shift Manual w/OD | Automatic w/Manual Shift | Automatic w/OD |
| Detailed Spec Comparison | |||
| 2018 Audi S7 vs. 2018 BMW M6 | 2018 Audi S7 vs. 2018 Cadillac CTS-V | 2018 Audi S7 vs. 2018 Mercedes-Benz CLS Class | |
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