didnt want to start a new thread on this, but happened to come across this chinese forum thread today on the 35/1.4 vs ultron 40mm f2
http://forum.ncphoto.cc/index.php?showtopic=16925
I always tot 35mm 1.4 wide open was not as good as raved ( low contrast, vignetting etc). But looking at the pics, it looks sharper than the ultron at f2 ! and my Ulton SL1 is already pretty sharp.