Some 11,000 customers have bought A3s since the model was first launched here in 1996, and across the markets where it has been sold it represents a fifth of all Audi sales.
The new Sportback has a longer wheelbase than the 3-door, and offers more leg and headroom, as well as an extended cargo space which can be used in a double-deck configuration. Its capacity is 380L with the rear seats up, expanded to 1,220L with the seats folded.
Target competitors are the BMW 1 Series and Mercedes-Benz new A-Class. Audi claims advantage across a range of comparisons, especially in fuel consumption and CO2 emissions.