Big Mercedes S63 is surprisingly fast on its feet

The top-of-the-range, fire-breathing AMG S63 model is packing the same twin-turbocharged V8 as the current C63 and E63, with 600bhp and a staggering 900Nm of torque.
Fitted within the S-Class, it transforms the car from a standard saloon into one that can hit 60mph in under four seconds, which is frankly astounding for a car of this size.