BMW 5 Series Gran Turismo (2015) is 20 mm (0.79 inch) higher than BMW 6 Series Gran Turismo (2018).
BMW 6 Series Gran Turismo (2018) is 84 mm (3.31 inch) longer, 2 mm (0.08 inch) wider, 335 kg (739 lbs) lighter and has 109 liters (3.85 ft3) bigger cargo space than BMW 5 Series Gran Turismo (2015).