[Guest]

But if I have such an impression I tty to counter check with a trusty person's findings. Too often it was my mistake or my need to improve my skills.

 

In my case, I counter checked with (i) other lenses I own, e.g., Canon 50 f/1.4 and Canon 35 f/2 IS... both of which AF perfectly on the same camera bodies (ii) DPReview's review of 18-35 f/1.8 lens which, like I said, behaves exactly the same way as my 30 f/1.4. I also had lots of painful experiences with 3rd party lenses in the past, but was willing to give the 30 f/1.4 a try because it belongs after all to a 'new' series of lenses from Sigma. My hopes were high but they were unfortunately dashed.