Audi A8 (2014) is 481 mm (18.94 inch) longer, 58 mm (2.28 inch) wider, 115 kg (254 lbs) lighter and has 24 liters (0.85 ft3) bigger cargo space than Mercedes GLC-Class (2017).
Mercedes GLC-Class (2017) is 199 mm (7.83 inch) higher than Audi A8 (2014).