BMW 6 Series Gran Turismo (2018) is 195 mm (7.68 inch) longer, 63 mm (2.48 inch) wider, 89 mm (3.50 inch) higher and has 129 liters (4.56 ft3) bigger cargo space than Mazda 6 (2017).
Mazda 6 (2017) is 286 kg (631 lbs) lighter than BMW 6 Series Gran Turismo (2018).