Cadillac STS (2017) is 549 mm (21.61 inch) longer and 30 mm (1.18 inch) wider than Mercedes GLA-Class (2014).
Mercedes GLA-Class (2014) is 41 mm (1.61 inch) higher, 364 kg (802 lbs) lighter and has 33 liters (1.17 ft3) bigger cargo space than Cadillac STS (2017).