It looks like I'm going to sell off my Pentax DSLRS and pick up the D600. I've been waiting on Pentax to make their own full frame, but I am growing tired of waiting. I shoot with fully manual primes exclusively and never use flash, so the (slight) shortcomings of the D600 will not bother me in the slightest. That dynamic range and color bit depth though will REALLY work well for me since I shoot mostly landscapes and wildlife. I'll probably wait a few months to sell off my gear and move to Nikon. Hopefully in that time the price will drop a little. I'll have my new Nex 5n to help tide me over until the switch anyway. My ONLY concern is that I shoot with M42 glass and to mount M42 to a Nikon body I have to use an optical element in the adapter. But I've seen many reviews, tests, and pictures that show that the optical element in a good adapter does not affect IQ in the slightest.