Kia Optima Sportswagon (2015) is 721 mm (28.39 inch) longer, 43 mm (1.69 inch) wider, 167 mm (6.57 inch) higher and has 218 liters (7.70 ft3) bigger cargo space than Mercedes SLK-Class (2014).
Mercedes SLK-Class (2014) is 95 kg (209 lbs) lighter than Kia Optima Sportswagon (2015).