BMW 3 Series Gran Turismo (2018) is 542 mm (21.34 inch) longer, 12 mm (0.47 inch) wider, 49 mm (1.93 inch) higher and has 140 liters (4.94 ft3) bigger cargo space than Seat Leon (2016).
Seat Leon (2016) is 522 kg (1,151 lbs) lighter than BMW 3 Series Gran Turismo (2018).