Audi Q8 (2019) is 601 mm (23.66 inch) longer, 208 mm (8.19 inch) wider, 150 mm (5.91 inch) higher and has 378 liters (13.35 ft3) bigger cargo space than Mercedes B-Class (2014).
Mercedes B-Class (2014) is 780 kg (1,720 lbs) lighter than Audi Q8 (2019).