BMW 8 Series (G14) (2018) is 145 mm (5.71 inch) longer and 88 mm (3.46 inch) wider than Opel Astra Sports Tourer (2017).
Opel Astra Sports Tourer (2017) is 196 mm (7.72 inch) higher, 448 kg (988 lbs) lighter and has 190 liters (6.71 ft3) bigger cargo space than BMW 8 Series (G14) (2018).
