I just posted some raws in the thread about 5Dmk3 AF and sensor improvements
both with the sigma and one with each body
Do you have a good copy or are the new copies all generally like that? =)
Not that I don't trust you, mind, just would like to get as much information as I can before I place an order on something I won't get to even try until I pay for it...
Also: Any AF issues? bad focusing, etc
Yes mine was heavily front focusing when i got it, needed +13 microadjust to get it in line
I sent it back and sigma reprogrammed it and now its pretty good still needs a little micro adjust but so do some of my canons but not that much though.
As far as AF speed and accuracy its spot on. the speed is at least 3 times faster than the canon 85 1.2 which is why i chose the sigma over the canon (it also happened to be 2.5 times cheaper
) I would recommend buying it from a bricks and mortar store you can go back to if anything is off in the AF department. Its one of my favourite lenses, (cant decide bewteen this and the 16-35 f2.8 II) i love them both but for different reasons.
It also has 9 circular apertutre blades which gives it really nice blur and bokeh
Build quality is really top notch and the MF ring is super smooth and firm (no slop or play in it so has nice control)