Mercedes’ venture into the four-door coupe niche started with the first-gen CLS. Fourteen years later, it has an even posher model to cater to those who want the practicality of a saloon, but without the drab image most family cars have. And, of course, extraordinary performance.

With a starting price of £121,350 ($159,228/€138,721) in the UK, which goes up to £135,550 ($177,860/€154,953) for the more powerful S version, this is definitely not a car aimed at the masses.

It combines the underpinnings of the E-Class, or the third-gen CLS if you prefer, with enhanced driving dynamics, a luxurious cockpit fitted with everything one can possibly imagine, and a very powerful 4.0-liter twin-turbo V8 under the hood.

Also Watch: Beast Mode ON: Mercedes-AMG GT 63 S 4-Door Coupe Nudges 190 MPH

In the GT 63, the lump pushes out 585 PS (576 hp / 430 kW) and 800 Nm (590 lb-ft) of torque. Go for the more powerful S and you’ll get 639 PS (630 hp / 470 kW) and 900 Nm (663 lb-ft) of torque.

Given those numbers, this is one very serious performance machine, especially if you consider that it can carry up to five occupants and their luggage. Naught to 100 km/h (0-62 mph) is done in as little as 3.2 seconds, and top speed stands at 315 km/h (195 mph) in the GT 63 S 4Matic+.

On paper, it seems like the car to go for in this exclusive niche; it’s either that, or the Porsche Panamera, which also comes in the even more practical Estate Sport Turismo guise. Deciding between the two ultimately comes down to individual taste, but for now, let’s see how the GT 4-Door fares in AutoTrader’s review.