Kia Optima Sportswagon (2015) is 462 mm (18.19 inch) longer, 74 mm (2.91 inch) wider and has 67 liters (2.37 ft3) bigger cargo space than Mercedes B-Class (2014).
Mercedes B-Class (2014) is 87 mm (3.43 inch) higher and 155 kg (342 lbs) lighter than Kia Optima Sportswagon (2015).