BMW 6 Series Gran Turismo (2020) is 815 mm (32.09 inch) longer, 134 mm (5.28 inch) wider and has 102 liters (3.60 ft3) bigger cargo space than Mazda 6 Atenza (2015).
Mazda 6 Atenza (2015) is 3 mm (0.12 inch) higher and 521 kg (1,149 lbs) lighter than BMW 6 Series Gran Turismo (2020).