Buick Regal (2017) is 56 mm (2.20 inch) higher and 100 kg (220 lbs) lighter than Mercedes CLS-Class (2018).
Mercedes CLS-Class (2018) is 109 mm (4.29 inch) longer, 25 mm (0.98 inch) wider and has 118 liters (4.17 ft3) bigger cargo space than Buick Regal (2017).