The Nikon D600 will likely become one of that company's best selling cameras in the enthusiast upgrade segment. It offers state-of-the-art image quality, reasonably high build quality, much desired full frame with its large and bright VF, and a range of features and functions which is little short of those on the D800s, for almost $1,000 less. While web pundits will debate the merits of the D600 vs. Canon's 6D in terms of features, and Sony's A99 in terms of price, the reality is that I think we are finding ourselves at a point in digital camera development where cross grading between brands will become less and less of an issue. All the major brands have feature sets and image quality that will meet most user's needs. Lenses are the core issue, and once someone has invested in some good Nikon, Canon, Sony/Zeiss glass cameras themselves are becoming mainly a subject of feature and budget considerations rather than just image quality.