Aston Martin DB9 (2015) is 20 mm (0.79 inch) wider than Kia Optima (2016).
Kia Optima (2016) is 136 mm (5.35 inch) longer, 182 mm (7.17 inch) higher, 195 kg (430 lbs) lighter and has 368 liters (13.00 ft3) bigger cargo space than Aston Martin DB9 (2015).