Buick Regal Sportback (2020) is 41 mm (1.61 inch) higher, 208 kg (459 lbs) lighter and has 70 liters (2.47 ft3) bigger cargo space than Mercedes S-Class Coupe (2015).
Mercedes S-Class Coupe (2015) is 126 mm (4.96 inch) longer and 35 mm (1.38 inch) wider than Buick Regal Sportback (2020).