Audi R8 (2014) is 18 mm (0.71 inch) wider and 515 kg (1,135 lbs) lighter than Mercedes M-Class (2015).
Mercedes M-Class (2015) is 359 mm (14.13 inch) longer, 543 mm (21.38 inch) higher and has 591 liters (20.87 ft3) bigger cargo space than Audi R8 (2014).