Nothing too definitive as yet, just a few samples from my new 14mm lens. It seems very, very sharp and distortion free. It isn’t a 35mm equivalent focal length I’m familiar with (21mm) but it is wide, which is why I wanted it.
All I can say is that I’m very happy with it thus far, I just want to find a landscape to use it on.
Note, any vignetting in the above is a product of post processing.
Update 03 February 2013: I took my X-Pro1 and 14mm out when I went to drop off some junk at a local charity shop and spent 15 minutes in and around another one of the local parks. It was very, very overcast today, so some of these are at higher ISOs.