Audi A4 Avant (2018) is 192 mm (7.56 inch) longer, 145 mm (5.71 inch) higher, 95 kg (209 lbs) lighter and has 155 liters (5.47 ft3) bigger cargo space than Mercedes AMG GT (2015).
Mercedes AMG GT (2015) is 97 mm (3.82 inch) wider than Audi A4 Avant (2018).