Audi A6 (2018) is 277 mm (10.91 inch) longer, 455 kg (1,003 lbs) lighter and has 180 liters (6.36 ft3) bigger cargo space than Mercedes GLC-Class (2020).
Mercedes GLC-Class (2020) is 16 mm (0.63 inch) wider and 204 mm (8.03 inch) higher than Audi A6 (2018).