Day 3 with my lens and mine is front focusing pretty badly too.
I currently have +6 dialed in. At close distance it seems to do the trick, further away it'll ff...
Here's an example, this is cropped so I wasn't as close as the photo looks. You can clearly see the little black and white bow on her tee being sharp.
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Front focusing example by Kinson C | Photography, on Flickr
Ok. I see you have a logo "Kinson C Photography." If your going to shoot an event as a paid professional or as a sideline as a semi professional will you trust your S35? Your next copy will you trust it too?? I found in dynamic lighting situations is where Sigma rears its ugly random oof AF issues. Hard to explain clients you wanted to save money on a sigma instead of a 35L. Landing the shot with excellent composition is equally as important on focusing on the subject :P
So far some have called me a Sigma "hater". Of all of my Sigma prime lenses I've purchased I've never had a solid performer.
This random focusing issues is why I am vocal about my personal tests with the Sigma primes. The AF issues are quite real and not over blown Internet talk.
I can see people quietly shifting to a different canon lens after all this excitement blows over. Sigma still cant fix the high percentages of sigmadud 50mm af issues "BUT" maybe there's a glimmer of hope with this "new tech" design of the Sig 35mm.
I only get bad misses due to user error. So far I've been extremely pleased with my canon lenses when accuracy is concerned.