Cadillac STS (2018) is 310 mm (12.20 inch) longer, 341 kg (752 lbs) lighter and has 38 liters (1.34 ft3) bigger cargo space than Mercedes GLC-Class (2017).
Mercedes GLC-Class (2017) is 56 mm (2.20 inch) wider and 206 mm (8.11 inch) higher than Cadillac STS (2018).