BMW 6 Series Gran Turismo (2018) is 149 mm (5.87 inch) longer, 604 kg (1,332 lbs) lighter and has 29 liters (1.02 ft3) bigger cargo space than BMW X6 (2020).
BMW X6 (2020) is 117 mm (4.61 inch) wider and 153 mm (6.02 inch) higher than BMW 6 Series Gran Turismo (2018).