Audi A8 (2018) is 516 mm (20.31 inch) longer, 55 mm (2.17 inch) wider, 83 kg (183 lbs) lighter and has 155 liters (5.47 ft3) bigger cargo space than Mercedes GLC-Class (2017).
Mercedes GLC-Class (2017) is 186 mm (7.32 inch) higher than Audi A8 (2018).