Looks like Sigma will have to deal with AF reports first and check this before release of the 85mm f/1.4 Art. This is not good advertisement for Sigma and their products.
My 50mm f/1.4 Art does not have AF problems. I am extremely happy with my copy.
I thought all the Arts were very, very well reviewed. Are you saying there is an AF problem with the 35 or 50 Art lenses? And is it something the USB firmware tool cannot fix?
Just to be clear, I do not have AF problems but at least 2 forum members here experience AF problems - there is a thread about it.
It is about the 50m f/1.4 Art and not the 35mm f/1.4 Art.
It just seems that there is a chance to receive a copy that suffers from AF problems. Given the history with the previous 50mm f/1.4 of Sigma, also AF issue, it is not good advertisement. It does not mean that it is consistent with AF problems. But the doubt is there....
I do not doubt you one bit, but I have to ask if this is a case of confirming that 'buying third party lenses is risky' or that we now hold new offerings from Sigma to a spectacularly high bar for AF. Sigma has burned folks before on AF, but so has Canon.
Virtually every review of the Sigma 35 and 50 Art ranges from very good
. The only thing I've heard is this passage from TDP:http://www.the-digital-picture.com/Reviews/Sigma-50mm-f-1.4-DG-HSM-Art-Lens.aspx(go to the butterfly mouseover interactive section and read the text above and below it)
I know this is a Sigma 85mm thread, but I am still trying to gather if the boogeyman of 'bad AF of Sigma lenses past' is fair for their more recent glass. From a how-I-think-it-will-work-right-now (without any testing) standpoint, I would argue native Canon lens AF is usually innocent until proven guilty, yet with Sigma, it often seems the other way around...