Audi Q8 (2019) is 448 mm (17.64 inch) longer, 55 mm (2.17 inch) wider, 418 mm (16.46 inch) higher and has 514 liters (18.15 ft3) bigger cargo space than Mercedes AMG GT (2015).
Mercedes AMG GT (2015) is 530 kg (1,168 lbs) lighter than Audi Q8 (2019).