BMW 8 Series (G15) (2018) is 218 mm (8.58 inch) longer, 124 mm (4.88 inch) wider and has 72 liters (2.54 ft3) bigger cargo space than Subaru Impreza GT (2017).
Subaru Impreza GT (2017) is 114 mm (4.49 inch) higher and 704 kg (1,552 lbs) lighter than BMW 8 Series (G15) (2018).