Two SUVs with some similarities, but otherwise different in most aspects such as the powertrain, modifications, horsepower, fuel economy, ground shadow size, and height. First of all, the 2016 Mercedes-Benz GLA-Class AMG GLA 45 4MATIC has a more powerful engine and gets 2 mpg less than the 2015 Audi Q5 Diesel. Also, not only 2015 Q5 Diesel is slightly larger, but it's also taller than the 2016 GLA-Class AMG GLA 45 4MATIC. Among similarities are the body structure, market segment, starting price, and maximum occupancy.