BMW 6 Series Gran Turismo (2020) is 544 mm (21.42 inch) longer, 250 mm (9.84 inch) higher and has 259 liters (9.15 ft3) bigger cargo space than Mercedes AMG GT (2017).
Mercedes AMG GT (2017) is 37 mm (1.46 inch) wider and 150 kg (331 lbs) lighter than BMW 6 Series Gran Turismo (2020).