I find that Pentax also gives you A LOT more control over the manual features of the camera that you don't get in comparably priced Canon or Nikon. This also means the Pentax is more complicated to use ... and I am a masochist.
But the one feature I like about the K10/K20 cameras is that a lot of the controls are right on the camera body itself, without going through the menu system to change it. That's just a winner right there.