Audi R8 Spyder (2020) is 4 mm (0.16 inch) wider than Mercedes AMG GT (2018).
Mercedes AMG GT (2018) is 120 mm (4.72 inch) longer, 49 mm (1.93 inch) higher, 10 kg (22 lbs) lighter and has 124 liters (4.38 ft3) bigger cargo space than Audi R8 Spyder (2020).