Audi A8 (2015) is 973 mm (38.31 inch) longer, 169 mm (6.65 inch) wider, 38 mm (1.50 inch) higher and has 149 liters (5.26 ft3) bigger cargo space than Mercedes A-Class (2015).
Mercedes A-Class (2015) is 615 kg (1,356 lbs) lighter than Audi A8 (2015).