The new TFSI engines in the Audis are really impressive. A lot of power for comparably low fuel consumption. Personally, my A4 1.8 TFSI drives really well but it does have a bit of that raw grunt which I really dont mind. I know the A4s have a different body but the Audi quality and performance would be similar.
Given that youre keen on the quattro, I suspect it will drive with more grip and better handling!
Fun times! Feel free to PM me if you have any questions!