Kia Optima (2017) is 26 mm (1.02 inch) longer, 451 kg (994 lbs) lighter and has 161 liters (5.69 ft3) bigger cargo space than Nissan CrossCabriolet (2017).
Nissan CrossCabriolet (2017) is 32 mm (1.26 inch) wider and 212 mm (8.35 inch) higher than Kia Optima (2017).