BMW 8 Series (G16) (2019) is 240 mm (9.45 inch) longer than Opel Insignia (2015).
Opel Insignia (2015) is 152 mm (5.98 inch) wider, 91 mm (3.58 inch) higher, 236 kg (520 lbs) lighter and has 100 liters (3.53 ft3) bigger cargo space than BMW 8 Series (G16) (2019).