I've not had any issues. The 35 f2 only struggles for me at a certain distance from the subject. If I'm having trouble I take a half step back and it's fine. I used it as my main lens at a wedding the other week and it was superb. I did a shoot a little while back with a friend of mine. We were both shooting a model in a dark urbex environment. She was using the X-T1 and 35mm 1.4. I was using the X-Pro2 and 35mm f2. I nailed every single shot without issue where she was really struggling. It may be that I know where to focus having had a few years experience and I'm just not thinking about it, but I do think the X-Pro2 is a bit faster. Where it is much faster is tracking moving subjects. I've just put something on my blog about that ( www.mikecroshaw.com ). Even the 56 doesn't give me many problems as long as there is not much movement. I do find the X-T1 a little more forgiving than the Xpro2 in terms of being able to shoot with a lower shutter speed though, especially on the 56.