Audi Q8 (2018) is 313 mm (12.32 inch) longer, 189 mm (7.44 inch) wider, 267 mm (10.51 inch) higher and has 384 liters (13.56 ft3) bigger cargo space than Mercedes C-Class (2017).
Mercedes C-Class (2017) is 730 kg (1,609 lbs) lighter than Audi Q8 (2018).