Buick Regal (2016) is 285 mm (11.22 inch) longer, 194 mm (7.64 inch) higher and has 52 liters (1.84 ft3) bigger cargo space than Mercedes AMG GT (2015).
Mercedes AMG GT (2015) is 82 mm (3.23 inch) wider and 30 kg (66 lbs) lighter than Buick Regal (2016).