BMW 8 Series (G15) (2018) is 352 mm (13.86 inch) longer, 94 mm (3.70 inch) wider, 46 mm (1.81 inch) higher and has 275 liters (9.71 ft3) bigger cargo space than Porsche 911 (2014).
Porsche 911 (2014) is 379 kg (836 lbs) lighter than BMW 8 Series (G15) (2018).