Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, and height, than differences, like the model year, modifications, horsepower, fuel economy, and maximum occupancy. First of all, the 2016 M5 has a more powerful engine and gets 3 mpg less than the 2013 E-Class Sedan E63 AMG. Also, you'll seat two more passengers in the E-Class Sedan E63 AMG than in the M5. Among similarities are the body structure, market segment, starting price, ground shadow size, and height.