Mercedes AMG GT (2018) is 13 kg (29 lbs) lighter than Opel Insignia (2017).
Opel Insignia (2017) is 296 mm (11.65 inch) longer, 145 mm (5.71 inch) wider, 209 mm (8.23 inch) higher and has 190 liters (6.71 ft3) bigger cargo space than Mercedes AMG GT (2018).