I'm going to go off topic just a bit here and say something that I'm sure has been covered on this forum any number of times, but AF isn't needed to take great (in focus!) sports images, keep up with moving kids, etc. That said, seeing as my K-01 is still not here, I'm not sure how practical it would be to do these things (focus peaking or not) on a live view screen, but there are millions of action packed images that were taken well before the advent of AF. I know I used to take a lot of action images with no AF (and no flash for that matter) on high speed B&W film using a hand me down K1000 and Canon AE-1. Of course I'm not saying that a great AF system doesn't help and isn't/wasn't game changing, just that it is not necessary.
Sorry, ranting. I get tired of hearing that the AF system is the end all, be all of camerdom. That said, with my aging eyes, it is helpful