Kia Optima Sportswagon (2015) is 319 mm (12.56 inch) longer, 20 mm (0.79 inch) wider, 330 kg (728 lbs) lighter and has 103 liters (3.64 ft3) bigger cargo space than Mercedes GLK-Class (2018).
Mercedes GLK-Class (2018) is 229 mm (9.02 inch) higher than Kia Optima Sportswagon (2015).