I have a new addition to my small number of Sigma lenses. I picked up a very nice copy of the 30mm f/1.4 lens on Friday. Below are a few test pictures taken while testing focus/IQ before I bought it and on the metro on the way home. For the first two I've included also 100% centre crops.
The lens is plenty sharp even wide open but the barrel distortion is certainly visible (it's been more-or-less fixed in the window shots). I've confirmed as reported that the corners are relatively soft, even stopped down to f/8, but for landscapes and other across-the-frame IQ sharp shots I still have my DA 35mm Limited. Despite it's advantages, I'm not sure that the Sigma will de-throne the Limited as my favourite AF prime. I'm looking forward to using it more though, as I've seen some amazing photos taken with it.
All of the shots below were taken at f/1.4. The first one was at ISO 400 (quite high by K200D standards), but it shows that I'm not used to using a lens quite this fast, as I could have gotten away with ISO 200 or even less in that light.
100% crop:
100% crop - bear in mind this was taken through two panes of very dirty, very scratched glass: