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How about when you use the center point? Would it otherwise focus spot on? Can you reliably reproduce the same outcome under different subjects? Have you tried this lens on another body? Does it happen wide open or stopped down?
My Sig 35 is on its way to me as we speak, but I'll be more than happy to report back when I receive it (albeit on a D600). FWIW, fast wideangles tend to misfocus from time to time due to the wide FOV, as per my experience with both 24 1.4G and 35 1.4G, especially when there's not enough...Show more →
AF accuracy is much better using the center points, and I observed last night that the problem gets progressively worse as I move from center points to outer points. The problem is not image clarity, it is most definitely backfocus.
I've tested with several different subjects under several different lighting conditions with near perfect repeatability. I have only tested wide open though, and haven't shot with the lens in a real world scenario yet. I haven't tested my current copy with my D700, but I did test the last one, and it seemed to do the same thing on both bodies.
I have the 24G and 35D, and previously owned the 35G. I can say with certainty that my other two wide primes don't exhibit this, but to be honest, I only had the 35G for a couple of months, and couldn't say for sure if it would have done the same thing. I searched my library for shots from that lens that used the outer focus points, and could only find a few, and they seemed fine.