Upload & Sell: Off
I just went from a wonderful D7000 to a D600. I know a D7000 isn't a D300 in terms of professional body, but I'm a guy who has a 4x5 Linhof Technica that, in the past, was for my serious photography, so I know the difference. Regardless of that experience I find the D600 a dramatic improvement. The full frame changes my lenses, which is the greatest pull for me. I just took a bunch of shots with my 55 3.5 ais micro nikkor near the ocean. It felt like I was shooting a wide angle, lol. The limitations of aps-c for wide angles is very apparent to me now. My 28 3.5 ai lens is an amazing wide angle now, and it only cost me 90 dollars. What could a person not love about that?
The noise and image quality from a raw file is amazing. Most online comparisons show only jpg and when that is the case the canon 5d III looks much better (although to me the 5d III images looks way oversharpened and unnatural), but if you view the raw images on dpreview you will see the D600 clearly equals or bests the 5D III in terms of noise and dynamic range.
I have a Canon system as well and can tell you that the low iso shadows of the D600 and, for that matter, the D7000 are in a totally different class from any Canon DSLR.
Sorry for the fanboyism . I just love this D600, but you won't see the improvement so much if you only use jpg. I can hardly wait for Adobe to release support for D600