Maserati GranTurismo (2016) is 20 mm (0.79 inch) longer and 59 mm (2.32 inch) wider than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 167 mm (6.57 inch) higher, 280 kg (617 lbs) lighter and has 299 liters (10.56 ft3) bigger cargo space than Maserati GranTurismo (2016).