Mazda 6 Atenza (2014) is 250 mm (9.84 inch) higher, 355 kg (783 lbs) lighter and has 322 liters (11.37 ft3) bigger cargo space than Toyota GR Supra (2020).
Toyota GR Supra (2020) is 103 mm (4.06 inch) longer and 92 mm (3.62 inch) wider than Mazda 6 Atenza (2014).