I sold my K-5 only with great reluctance and I personally will reacquire one as soon as the next-model-price-drop gets really good
The K-5, to my mind, is the perfect DSLR. However I was finding the size of *any* DSLR, even such a small one as the K-5, was preventing me from carrying a camera as often as I wanted to (i.e. every minute of the day :P). So I jumped ship for a smaller form factor (initially an M8 but it was too heavy, then to the Fuji X100 which is just fantastic).
If I'd had the money, I would have *both* cameras without a doubt. Of course....having used the X100 I'm now dreaming of the X-Pro-1, dayum!
Ha - if I had the money, I'd have them alllll :P But buying & reselling is the only way I can afford to play with lots of options. Hopefully I'll settle down one day!
ETA: And yes, my awareness that the K-5 will soon drop in value as the K-3 arrives on the scene did push me to sell sooner than I otherwise might have.