Kia Optima (2017) is 445 mm (17.52 inch) longer, 26 mm (1.02 inch) wider, 3 kg (7 lbs) lighter and has 75 liters (2.65 ft3) bigger cargo space than Mercedes GLA-Class (2017).
Mercedes GLA-Class (2017) is 141 mm (5.55 inch) higher than Kia Optima (2017).