Owned an '08 B7 (S-Line + Sport), had a '12 B8 (Premium) for 5 months. Both quattro.
My recommendation would be to only get one if you're getting sport package (for the better seats and sport suspension). S-Line in the B8's make them even better. Otherwise, the car feels very numb and unresponsive - nothing like your 335. They are pretty cars though...
Oil burning wasn't much of an issue for me.
'09 335i /i\ ZSP /|\ CA /i\ Piano Trim /|\ BMW PE /i\ AG M359