BMW 6 Series Gran Turismo (2020) is 401 mm (15.79 inch) longer, 246 mm (9.69 inch) higher and has 455 liters (16.07 ft3) bigger cargo space than BMW i8 (2019).
BMW i8 (2019) is 40 mm (1.57 inch) wider and 235 kg (518 lbs) lighter than BMW 6 Series Gran Turismo (2020).