Two Sedans with more similarities, such as the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy, than differences, like the starting price and horsepower. First of all, the 2015 Mercedes-Benz S-Class Sedan is priced $20,500 lower compared to the base MSRP of the 2016 Audi S8. And finally, the 2016 S8 pulls more horsepower than the 2015 S-Class Sedan. Among similarities are the body structure, market segment, fuel economy, ground shadow size, height, and maximum occupancy.