1. I do not see how it is "fanboyism" to mention facts that are advantages of the D600 over the 6D, and indeed attempting to dismiss the relevance of those advantages seems more subject to that accusation.
2. The disadvantages in viewfinder and video capabilities are not mitigated at all by the fact that previous Canon models also had these disadvantages relative to the competition (not only Nikon but also Sony in recent years.)
3. As to the "different priorities" argument, I suppose it is a matter of personal preference which is more important:
- the D600's better AF, video, and VF, somewhat higher resolution, and likely better DR (on recent trends), or
- The 6D's geo-tagging and Wi-Fi without needing an add-on unit. (Are these really the only advantages you can mention? I think I made a better case with "likely better high ISO performance and lens system".)
1. I shoot Nikon, so no fanboyism here.
2. Whether the viewfinder is an advantage or a disadvantage wasn't the point of my comment. My point was, simply, that this is not something many Canons have ever had so noting it as a material difference doesn't, to me, seem relevant. Disadvantages in video? Based on what I've read it seems pretty well settled that the quality of Canon's video is superior to Nikon's. I've not yet seen a compelling argument that the uncompressed video from a Nikon is markedly superior to the compressed video.
3. D600's better AF? How can that be determined when the camera isn't even available for serious testing yet? "Likely better DR" is a complete assumption. I'm not saying it won't have better range than the Canon but making such statements without actual data, even basing on recent trends, isn't valid analysis.
4. Unlike many people here, I don't spend countless hours poring over camera data, cruising from website to website looking for technical minutiae, pixel-peeping or otherwise examining in excruciating detail things which, in real world, practical shooting won't make a big difference. The infinitesimal differences in SNR for the 5D Mk III and D800 don't make a hill of beans difference. Even the ~2.5 stops of drange at base ISO (according to DxO Mark, according to Imaging Resource it's less than 1 stop, but I grant the measures are done differently) isn't a huge concern because I know there are ways to work around that. Lens system is a matter of preference. There are Canon lenses that perform better than the like Nikon and vice versa. There are third party lenses that, in some cases, perform better than both.