Buick Regal Sportback (2018) is 522 mm (20.55 inch) longer, 2 mm (0.08 inch) wider, 163 mm (6.42 inch) higher and has 285 liters (10.06 ft3) bigger cargo space than Toyota GR Supra (2018).
Toyota GR Supra (2018) is 113 kg (249 lbs) lighter than Buick Regal Sportback (2018).