McLaren GT (2020) is 239 mm (9.41 inch) wider and 29 kg (64 lbs) lighter than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 229 mm (9.02 inch) longer, 299 mm (11.77 inch) higher and has 140 liters (4.94 ft3) bigger cargo space than McLaren GT (2020).