BMW 8 Series (G15) (2020) is 1 mm (0.04 inch) longer than Opel Insignia (2017).
Opel Insignia (2017) is 182 mm (7.17 inch) wider, 157 mm (6.18 inch) higher, 166 kg (366 lbs) lighter and has 120 liters (4.24 ft3) bigger cargo space than BMW 8 Series (G15) (2020).