Just before I logged in here I wrote this over in Flickr Pentaxians to a fellow member....
"As a side note, I was concerned about the flash results of the 540 and 360 on the K5......I haven't really tried many with the 360, but have done a good many in various conditions and angle settings with the 540 and find it more accurate than it was on the K20D or K10D.......not sure what to make of this, but I am not complaining. PTTL is actually usable, however I still prefer manual settings if the opportunity allows."
This must be a problem that is repairable , or else I have a defective K5 that delivers good results in any swivel position or any light. I will say that I am not a PTTL fan, I think I most always do better in manual mode, but it is tons better than on my K10 or 20D.
I do see a lot of variance in the K5, this is troubling, and hopefully the next major model will be more stable across the board. I read these things, and wonder if I am just dreaming, but results are results, and my results have been very pleasing.
Best Regards!