Citroen C6 (2017) is 254 mm (10.00 inch) longer, 284 kg (626 lbs) lighter and has 71 liters (2.51 ft3) bigger cargo space than Mercedes GLC-Class (2016).
Mercedes GLC-Class (2016) is 31 mm (1.22 inch) wider and 196 mm (7.72 inch) higher than Citroen C6 (2017).