Buick Regal Sportback (2020) is 10 mm (0.39 inch) wider than Chevrolet Impala Limited (2015).
Chevrolet Impala Limited (2015) is 190 mm (7.48 inch) longer, 36 mm (1.42 inch) higher, 129 kg (284 lbs) lighter and has 57 liters (2.01 ft3) bigger cargo space than Buick Regal Sportback (2020).