BMW 6 Series Gran Turismo (2018) is 808 mm (31.81 inch) longer, 86 mm (3.39 inch) wider, 80 mm (3.15 inch) higher and has 229 liters (8.09 ft3) bigger cargo space than Seat Leon (2016).
Seat Leon (2016) is 582 kg (1,283 lbs) lighter than BMW 6 Series Gran Turismo (2018).