I find the AF of the Pentax puzzling so far. Seems like a firmware patch must be coming up. I have been able to autofocus fairly fast on some difficult subjects and "it gets it" but something as simple as a parking sign seems slightly out of focus (DA70 at 2.4).
I tried the lens adjustment and whatI have found is that some subjects seem spot on with no correction but a few then go one way or the other. Seems like say a parking sign with red letters like "No Parking" with Parking hours in letters and words will benefit from an adjust, but some other subjects are spot on. I tried using another AF point and it was similar.
The live view AF is pretty spot on. I can focus using manual focus it seems often (which is good since I find virtually all digital SLR's here as not very good using the OVF).
I still don't quite understand, but the focus seems really good for some truly difficult subjects and on some basic stuff it can go off the wrong way.
Seems like Autofocus has been for many brands an issue (phase detection). in different ways. I understand Pentax is working on a firmware update for Tungsten light, as it as found by Pentaxeros I think it is, that 25 bodies had the same problem. in tungsten.