Two Sedans 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 horsepower. And finally, the 2015 Mercedes-Benz C-Class Sedan has a more powerful engine than the 2016 Audi A4. Among similarities are the body structure, market segment, starting price, fuel economy, ground shadow size, height, and maximum occupancy.