BMW 6 Series Gran Turismo (2018) is 181 mm (7.13 inch) longer, 305 kg (672 lbs) lighter and has 29 liters (1.02 ft3) bigger cargo space than BMW X6 (2017).
BMW X6 (2017) is 87 mm (3.43 inch) wider and 163 mm (6.42 inch) higher than BMW 6 Series Gran Turismo (2018).