Buick Regal TourX (2018) is 46 mm (1.81 inch) longer, 66 mm (2.60 inch) higher, 93 kg (205 lbs) lighter and has 80 liters (2.83 ft3) bigger cargo space than Mercedes CLS-Class (2016).
Mercedes CLS-Class (2016) is 20 mm (0.79 inch) wider than Buick Regal TourX (2018).