Audi A4 Avant (2017) is 82 mm (3.23 inch) longer, 550 kg (1,213 lbs) lighter and has 155 liters (5.47 ft3) bigger cargo space than Mercedes GLC-Class (2016).
Mercedes GLC-Class (2016) is 48 mm (1.89 inch) wider and 225 mm (8.86 inch) higher than Audi A4 Avant (2017).