Two Coupes with more similarities, such as the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the model year and horsepower. First of all, the 2013 S5 Coupe produces fewer horsepower than the 2016 M2. Among similarities are the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy.