...I have been extremely happy with my 35mm Art as most are who own it and I have not had any issues with the focus and it seems that just guys with red-line fever (not that there is anything wrong with "L" glass in general), have some imaginary data on this "drifting focus" problem that I have not experienced. Has anyone that owns the lens had an issue with focusing??? Its certainly possible.
At any rate I think that SOON we should see some real tests on the new 50mm and really know what the price is. (I wish that Sigma had not said that they are aiming at the Otus...it just sets them up for target practice....LOL!).
I think Eldar mentioned it in his post, maybe he can elaborate? Not that Canon lenses don't have issues, of course.
The proof is in the pudding, if Sigma comes up with something really good, they will sell them well. Who cares what people say, it's where they put their money.
I bought the 35A just a few weeks after it was released. I did an AFMA through Focal, which gave just a couple of steps adjustment on both 1DX and 5DIII. I was very impressed with the lens´sharpness, contrast, CA and color. Bokeh is not its strong side and it has some vignetting, but probably not more than should be expected.
After a couple of months I started to get more and more images out of focus and around Christmas it was useless shot wide open. I did another AFMA and I had to adjust 7 steps compared to the old setting on both bodies. I have used it a little less since then, but it seems to have stayed stable since AFMA no.2.
The Otus is a phenomenal lens and I am really enjoying it. But as soon as things start to move I miss AF. So as I have said before, this Sigma 50A is something I am really looking forward to try. But I doubt we will see it for $790, at least not for a while. Sigma is not unlike any other company. They´re only in it for the money.
Thanks for the input about the focusing. I have the 35mm Art and if I get the 50mm I think I will pick up the Sigma lens module.
I wish that was the type of thing we could share. Have one communal module. Mail it like it was inter library loan.