Audi Q8 (2020) is 338 mm (13.31 inch) longer, 104 mm (4.09 inch) wider, 48 mm (1.89 inch) higher and has 514 liters (18.15 ft3) bigger cargo space than Mercedes GLC-Class (2014).
Mercedes GLC-Class (2014) is 170 kg (375 lbs) lighter than Audi Q8 (2020).