Audi R8 (2015) is 21 mm (0.83 inch) longer and 140 mm (5.51 inch) wider than Mercedes GLA-Class (2016).
Mercedes GLA-Class (2016) is 249 mm (9.80 inch) higher, 240 kg (529 lbs) lighter and has 322 liters (11.37 ft3) bigger cargo space than Audi R8 (2015).