BMW 8 Series (G16) (2020) is 169 mm (6.65 inch) longer and 76 mm (2.99 inch) wider than Opel Insignia Sports Tourer (2015).
Opel Insignia Sports Tourer (2015) is 106 mm (4.17 inch) higher, 309 kg (681 lbs) lighter and has 120 liters (4.24 ft3) bigger cargo space than BMW 8 Series (G16) (2020).