BMW 4 Series (2020) is 58 kg (128 lbs) lighter than Opel Insignia (2015).
Opel Insignia (2015) is 74 mm (2.91 inch) longer, 232 mm (9.13 inch) wider, 115 mm (4.53 inch) higher and has 100 liters (3.53 ft3) bigger cargo space than BMW 4 Series (2020).