Two Coupes with some similarities, but otherwise different in most aspects such as the modifications, starting price, horsepower, fuel economy, market segment, ground shadow size, and height. First of all, there is a $90,200 difference in the base MSRP. The 2015 Mercedes-Benz S-Class Coupe S 65 AMG has a higher starting price than the 2016 BMW i8. Also, the 2015 S-Class Coupe S 65 AMG has a more powerful engine and gets 13 mpg less than the 2016 i8. In addition, not only i8 is slightly smaller, but it's also shorter than the S-Class Coupe S 65 AMG. Among similarities are the body structure, market segment, and maximum occupancy.