BMW 3 Series Gran Turismo (2021) is 551 mm (21.69 inch) longer, 61 mm (2.40 inch) wider and has 14 liters (0.49 ft3) bigger cargo space than Mazda 6 Atenza (2014).
Mazda 6 Atenza (2014) is 33 mm (1.30 inch) higher and 306 kg (675 lbs) lighter than BMW 3 Series Gran Turismo (2021).