Although I bought the D800 before the D600 became available I would still stick with that choice. My reason? I need and use high pixel density in a full frame camera. That's because I always enjoyed the image quality obtained from medium format film. While the D800 is not a complete replacement for medium format film it easily equals and sometime surpasses m/f up to about 30 inches on a side for prints, providing you have the best lenses. It's a lot lighter than the film gear and much more versatile. To be honest, I seldom use the film gear anymore. I have several DSLR bodies but this is the first one that really opens a big gap in image quality between digital and film, with digital the winner. For the most avid sports action shooters the D800 might lack somewhat in frame rate and buffering speed so that's the caveat.