Two SUVs with some similarities, but otherwise different in most aspects such as the powertrain, starting price, horsepower, fuel economy, ground shadow size, and maximum occupancy. First of all, the 2016 Acura MDX has a more powerful engine and gets 5 mpg less than the 2015 Audi Q5 Diesel. Also, there is a notable difference in the starting price of the 2016 MDX, which is $4,485 less than the base MSRP of the 2015 Q5 Diesel. In addition, the MDX has a slightly larger body than the Q5 Diesel. And then, you'll seat two more passengers in the Acura MDX than in the Audi Q5 Diesel. Among similarities are the body structure, market segment, and height.