It has lighter glass to move, I guess. And firmwares have been updated quite a bit from the early days. In my X-T1 it's focus performs just as well as with the 56mm, in bright daylight. I was also really hesitant myself since I had read so many bad comments about it's focus speed. But in good lighting it's nothing to worry about. And in macro I use the manual focusing instead.
Sure, 56 is awesome and I think I'll buy it again, just to have the razor thin dof. But this 60 is a keeper for sure.