Two Sedans with more similarities, such as the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy, than differences, like the powertrain, horsepower, fuel economy, and model year. First of all, the 2014 S-Class has a more powerful engine than the 2016 A8 Diesel, and it gets 8.5 fewer miles on a gallon of fuel. Among similarities are the body structure, market segment, starting price, ground shadow size, height, and maximum occupancy.