Audi A8 (2014) is 242 mm (9.53 inch) longer and 94 mm (3.70 inch) wider than Mercedes E-Class (Estate) (2017).
Mercedes E-Class (Estate) (2017) is 36 mm (1.42 inch) higher, 74 kg (163 lbs) lighter and has 296 liters (10.45 ft3) bigger cargo space than Audi A8 (2014).