[Rover]

Well, the 14mm is a known diamond-in-the-rough. It has a lot of flare and pretty soft edges (unless you stop way down - even on a Canon 1D series) due to strong field curvature, and the AF is sometimes confused (I guess it can be explained because a lot of shooting involves vast distant objects with small detail, as opposed to a well defined central subject that is easy to lock on to). But I'm pretty sure the Arts are an altogether different matter yet...