Citroen C6 (2020) is 364 mm (14.33 inch) longer, 174 mm (6.85 inch) higher and has 71 liters (2.51 ft3) bigger cargo space than Mercedes AMG GT (2017).
Mercedes AMG GT (2017) is 80 mm (3.15 inch) wider and 171 kg (377 lbs) lighter than Citroen C6 (2020).