Two Sedans with more similarities, such as the body structure, market segment, starting price, fuel economy, height, and maximum occupancy, than differences, like the model year, horsepower, and ground shadow size. First of all, the 2013 MKZ pulls more horsepower than the 2016 A4. Also, the A4 is slightly smaller than the MKZ. Among similarities are the body structure, market segment, starting price, fuel economy, height, and maximum occupancy.