Considering I went from a 330i to a 335d could not imagine doing it the other way around tbh as silky smooth and lovely sounding the 330i is on full chat.
Think the 335d is a bit of a victim of its own success if that makes any sense. It does what it does very well.
An analogy: The 335d is a bloke who is good at sex but slightly predictable and lacks the intensity of those rare others who really make the juices constantly flow.
