Aston Martin DB9 (2014) is 263 mm (10.35 inch) longer and 84 mm (3.31 inch) wider than Audi A3 (Sedan) (2015).
Audi A3 (Sedan) (2015) is 133 mm (5.24 inch) higher, 475 kg (1,047 lbs) lighter and has 283 liters (9.99 ft3) bigger cargo space than Aston Martin DB9 (2014).