Aston Martin DB9 (2014) is 58 mm (2.28 inch) longer and 84 mm (3.31 inch) wider than Mazda 3 (Sedan) (2018).
Mazda 3 (Sedan) (2018) is 162 mm (6.38 inch) higher, 392 kg (864 lbs) lighter and has 277 liters (9.78 ft3) bigger cargo space than Aston Martin DB9 (2014).