Buick Regal Sportback (2020) is 660 mm (25.98 inch) longer, 87 mm (3.43 inch) wider, 170 mm (6.69 inch) higher and has 227 liters (8.02 ft3) bigger cargo space than Toyota GT86 (2017).
Toyota GT86 (2017) is 527 kg (1,162 lbs) lighter than Buick Regal Sportback (2020).