interesting. I've considered moving over to Canon or Nikon for the increased ISO performance and autofocus (since that's the kind of shots I do), but for me to upgrade and sell my Pentax gear is VERY expensive!!
I think upgrading to another brand is subjective to price differentials and costs. If I were to move over to something else, it would have to be a major upgrade with some very major reasons to move. Moving brands is not cheap and the Pentax seems to do a decent job of most of what I do anyways at the moment.
But let me shoot a few more assignments and maybe I'll change my tune
I find that Pentax holds its own very well in the price bracket for which it was intended.
Once you go up higher, Pentax doesn't yet have anything to offer beyond the K-7 and that's where Canon and Nikon currently reign supreme with full frame offerings and other crazy camera goodieS.