Audi A4 Allroad (2017) is 204 mm (8.03 inch) longer, 204 mm (8.03 inch) higher and has 155 liters (5.47 ft3) bigger cargo space than Mercedes AMG GT (2018).
Mercedes AMG GT (2018) is 97 mm (3.82 inch) wider and 10 kg (22 lbs) lighter than Audi A4 Allroad (2017).