Sigma Art 50mm with 7D

[zhaoqingMal]

I'm still debating which fast prime to get, and have also been looking at the Sigma Art 50mm for the last couple of days.

Is the AF accuracy really a major problem with this lens, or is it something that only a few people seem to encounter?

I'm also interested in how this lens works with the original 7D AF system. Is there any issues here?

Thanks,