Citroen C6 (2020) is 532 mm (20.94 inch) longer, 171 mm (6.73 inch) higher and has 236 liters (8.33 ft3) bigger cargo space than Toyota GR Supra (2018).
Toyota GR Supra (2018) is 1 mm (0.04 inch) wider and 187 kg (412 lbs) lighter than Citroen C6 (2020).