Kia Optima (2015) is 405 mm (15.94 inch) longer and 79 mm (3.11 inch) wider than Subaru Crosstrek (2015).
Subaru Crosstrek (2015) is 150 mm (5.91 inch) higher, 105 kg (231 lbs) lighter and has 121 liters (4.27 ft3) bigger cargo space than Kia Optima (2015).