Audi A8 (2015) is 609 mm (23.98 inch) longer, 59 mm (2.32 inch) wider, 90 kg (198 lbs) lighter and has 140 liters (4.94 ft3) bigger cargo space than Mercedes GLC-Class (2020).
Mercedes GLC-Class (2020) is 188 mm (7.40 inch) higher than Audi A8 (2015).