Again, I'm another EF lens user and not Nikon anymore! I picked up a bunch of Sigma lenses in the past and what a waste of time, both in batch variance, and feel or quality in general.
Sigma released the new set of A1 lenses hoping to change all and and I thought I'll give it a go, if not then a refund and back to B&H it goes!
I have to say I am completely smitten with the lens. Despite it not being my focal length of choice, I have to admit it is slowly changing together with the use of the RX1. I will go as far to say, even if Canon releases a superior replacement to their 35mm L, it won't really matter to me. Main highlights for me: sharp, fast, accurate AF, micro contrast and bokeh. Okay it's not weather sealed, but I don't shoot in the rain! Oh it is seriously well built and looks sexy, but time will tell if it is reliable.
I did have to set AF micro adjustment, which I feel is quite reasonable, but once set, it has been reliable and focus spot on. I am interested if the USB dock could actually zero that.