I have the current Sigma 30 1.4. Bokeh is nice, however, it is a bit "dreamy" wide open, but gets quite sharp in the center at around f1.8. What bugs me the most though, and is the reason why I don't use it that much is the crappy AF... its more like a lottery.
When Sigma announced the FF 35 1.4, and everyone started raving about the great IQ and
I decided for me that I will sell the 30mm on medium-term and get the 35 once the latter's price goes down a bit more. While this would probably cost me ~500€, it would hopefully give me a lens that I actually use and at the same time make my lens collection just a bit more FF capable, in case I ever pick up a 5DIII, 6D etc.
Now Sigma announces the revised APS-C-only 30mm... aside from fearing for the resale value of my old sample (which probably ain't too great anyway
, but which I hoped would ease the pain of buying the 35mm at least somewhat), I think I will still stick with my original plan: Unless the new 30mm turns out to be at least as good or even better than the 35 regarding both AF and IQ and
is significantly cheaper, I see no reason to not go for the 35.
What do you think?