My K-5 is going to the service center for repair under warranty due to a problem with the pop-up flash. When I push the flash button, the flash won't pop up unless I pry up the flash unit as I hold down the button. The hook would barely move even if I pressed the button hard. While I generally use a shoe-mounted flash, I do use the pop-up flash for fill flash occasionally, so it matters to me. I guess I'll have to stick to my K-r for the next month, but isn't this why we keep backup camera bodies?
In any case, I'll miss the K-5's ergonomics and performance for some time...
--DragonLord