Kia Optima Sportswagon (2015) is 53 mm (2.09 inch) higher, 225 kg (496 lbs) lighter and has 33 liters (1.17 ft3) bigger cargo space than Mercedes CLS-Class (2016).
Mercedes CLS-Class (2016) is 85 mm (3.35 inch) longer and 22 mm (0.87 inch) wider than Kia Optima Sportswagon (2015).