Since i am behind...forgive me...how are you liking the Sigma 20Art David?
I think it's great! Super sharp - as sharp as the Loxia 21.
If you ever shoot at f1.4 with this lens, I'd be very interested in seeing it/them.
I need more time with it at f/1.4. At 20mm it's not going to show much OOF blur unless the focal distance is relatively close - and that's exactly what I want for night-time street shooting. In this case, my focal distance is relatively close (the signs) and the background does blur. The thing I really appreciate is that in spite of the 20mm focal length the OOF blur seems smooth and not too nervous to me - I'm pretty sensitive to that sort of thing.[IMAGE'S LINK: https://flic.kr/p/HivFY9]
The Kill Devil Club by David Arbogast, on Flickr