BMW 8 Series (G16) (2020) is 536 mm (21.10 inch) longer, 118 mm (4.65 inch) higher and has 90 liters (3.18 ft3) bigger cargo space than Mercedes AMG GT (2018).
Mercedes AMG GT (2018) is 7 mm (0.28 inch) wider and 264 kg (582 lbs) lighter than BMW 8 Series (G16) (2020).