Two Coupes with some similarities, but otherwise different in most aspects such as the starting price, horsepower, fuel economy, and ground shadow size. First of all, there is a notable difference in the starting price of the 2016 Audi S5 Coupe, which is $66,800 less than the base MSRP of the 2015 Mercedes-Benz S-Class Coupe. Also, the 2015 S-Class Coupe has a more powerful engine and gets 1.5 mpg less than the 2016 S5 Coupe. And finally, the body structure of S5 Coupe is slightly smaller than that of the S-Class Coupe. Among similarities are the body structure, market segment, height, and maximum occupancy.