Mercedes GLK-Class (2014) is 1841 mm (72.48 inch) longer, 177 mm (6.97 inch) wider, 144 mm (5.67 inch) higher and has 260 liters (9.18 ft3) bigger cargo space than Smart Fortwo (2015).
Smart Fortwo (2015) is 930 kg (2,050 lbs) lighter than Mercedes GLK-Class (2014).