Cadillac CT6 (2018) is 774 mm (30.47 inch) longer and 46 mm (1.81 inch) wider than Mercedes GLA-Class (2020).
Mercedes GLA-Class (2020) is 138 mm (5.43 inch) higher, 100 kg (220 lbs) lighter and has 2 liters (0.07 ft3) bigger cargo space than Cadillac CT6 (2018).