The 8 Series is available with two engines from launch: one diesel and one petrol You can choose from the diesel 840d or the petrol M850i The BMW 8 Series is a large coupe designed to cover big distances at speed Compared to the 8 Series, the Mercedes S-Class Coupe is larger and offers more interior space The 8 Series is sharp to drive despite its considerable size The sharp styling of BMW's flagship coupe lends it considerable presence on the road All BMW 8 Series come as standard with 20-inch alloy wheels The M850i gets a number of sporty exterior touches, plus optional items like carbon door mirrors The BMW M850 is powered by a 4.4-litre V8 petrol engine with 523bhp