TCL-X100 makes me smile
I missed your post on this lens and have just seen it now after posting my own.
I received my lens on Tue and grabbed some quick images with it that I am very happy with, I was surprised at the size, it is smaller than I expected but still a solid well made lens with a huge front element (now put a UV on it fro protection).
I have not found any noticeable difference in AF in normal lighting and it is only fractionally slower in low light (shooting with X100s) - the bokeh is superb and it will make a great street/portrait lens.