Audi A8 (2015) is 370 mm (14.57 inch) longer and 95 mm (3.74 inch) wider than Mercedes E-Class (Estate) (2017).
Mercedes E-Class (Estate) (2017) is 25 mm (0.98 inch) higher, 99 kg (218 lbs) lighter and has 180 liters (6.36 ft3) bigger cargo space than Audi A8 (2015).