Buick Regal Sportback (2018) is 210 mm (8.27 inch) longer, 85 mm (3.35 inch) higher and has 155 liters (5.47 ft3) bigger cargo space than Nissan GT-R (2020).
Nissan GT-R (2020) is 33 mm (1.30 inch) wider and 17 kg (37 lbs) lighter than Buick Regal Sportback (2018).