Maserati Quattroporte (2019) is 350 mm (13.78 inch) longer and 92 mm (3.62 inch) wider than Opel Insignia Sports Tourer (2020).
Opel Insignia Sports Tourer (2020) is 32 mm (1.26 inch) higher, 260 kg (573 lbs) lighter and has 30 liters (1.06 ft3) bigger cargo space than Maserati Quattroporte (2019).