BMW 8 Series (G16) (2019) is 393 mm (15.47 inch) longer, 114 mm (4.49 inch) higher and has 286 liters (10.10 ft3) bigger cargo space than BMW i8 (2016).
BMW i8 (2016) is 10 mm (0.39 inch) wider and 334 kg (736 lbs) lighter than BMW 8 Series (G16) (2019).