Mercedes GLK-Class (2017) is 38 mm (1.50 inch) longer, 53 mm (2.09 inch) wider, 260 mm (10.24 inch) higher and has 150 liters (5.30 ft3) bigger cargo space than Opel Ampera (2014).
Opel Ampera (2014) is 223 kg (492 lbs) lighter than Mercedes GLK-Class (2017).