BMW 3 Series Gran Turismo (2021) is 280 mm (11.02 inch) longer, 220 mm (8.66 inch) higher, 65 kg (143 lbs) lighter and has 171 liters (6.04 ft3) bigger cargo space than Mercedes AMG GT (2017).
Mercedes AMG GT (2017) is 110 mm (4.33 inch) wider than BMW 3 Series Gran Turismo (2021).