Kia Optima (2016) is 260 mm (10.24 inch) longer and 64 mm (2.52 inch) wider than Subaru Forester (2016).
Subaru Forester (2016) is 267 mm (10.51 inch) higher, 63 kg (139 lbs) lighter and has 382 liters (13.49 ft3) bigger cargo space than Kia Optima (2016).
