Two Sedans with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, and height. First of all, the 2015 Mercedes-Benz S-Class Sedan is priced $22,800 lower compared to the base MSRP of the 2016 BMW M6 Gran Coupe. Also, the 2016 M6 Gran Coupe has a more powerful engine than the 2015 S-Class Sedan, and it gets 2 fewer miles on a gallon of fuel. And finally, the M6 Gran Coupe has a slightly taller body than the S-Class Sedan. Among similarities are the body structure, market segment, ground shadow size, and maximum occupancy.