I have a few days off and I'm up in the coutry and am spending some time trying out the IIs
I'll be posting more about it soon, but my first impressions is that the new focus system is better in lower light, snappier and faster BUT not that much more precise.
With the DA*16-50 is seems to focus a bit more precisely most of the time
With the FA50 it's almost always dead on, even in low light at f1.4
With the DA 10-17 it's also almost always dead on
With the DA55-300 it's ok up to 200mm, above that it's very hit and miss.
I cannot comment on my DA*60-250 as it's at Pentax Canada getting fixed... again.
I tried to follow a bird in flight with focus in auto mode, no improvements that I can tell there... seems the camera just chose random points in an empty sky as a bird flew thru the frame.
I upgraded the firmware to 1.4 and as others have mentioned, it broke the live view focusing with my DA55-300 (it just hunts, whereas it was fast and precise on firmware 1.0)
Pat