Kia Optima (2015) is 613 kg (1,351 lbs) lighter than Mercedes X-Class (2018).
Mercedes X-Class (2018) is 485 mm (19.09 inch) longer, 60 mm (2.36 inch) wider, 354 mm (13.94 inch) higher and has 650 liters (22.95 ft3) bigger cargo space than Kia Optima (2015).