Kia Optima (2015) is 1035 kg (2,282 lbs) lighter than Mercedes GL-Class (2014).
Mercedes GL-Class (2014) is 291 mm (11.46 inch) longer, 138 mm (5.43 inch) wider, 385 mm (15.16 inch) higher and has 170 liters (6.00 ft3) bigger cargo space than Kia Optima (2015).