Mercedes AMG GT (2015) is 83 mm (3.27 inch) wider than Opel Insignia Sports Tourer (2017).
Opel Insignia Sports Tourer (2017) is 367 mm (14.45 inch) longer, 224 mm (8.82 inch) higher, 45 kg (99 lbs) lighter and has 210 liters (7.42 ft3) bigger cargo space than Mercedes AMG GT (2015).