Mercedes GLC-Class (2016) is 158 mm (6.22 inch) longer, 103 mm (4.06 inch) wider, 220 mm (8.66 inch) higher and has 50 liters (1.77 ft3) bigger cargo space than Opel Ampera (2014).
Opel Ampera (2014) is 443 kg (977 lbs) lighter than Mercedes GLC-Class (2016).