Well it seems there is plenty of school of thoughts. Yes I been using D7000 from my Dad for a while. Granted that I am not considered a expert, I do feel that it is lacking. Primarily when the lighting is less than perfect like in the evening using dim street light, it just do not cut it hand held. I always hoping that FX will solve that problem then i saw the demo on 5D mark 3 which seems awesome with low light compared to the last gen 5D mark 2 and that is when I realize D800 is well supposed to be its competitor so I rope it in for comparison, indeed in term of low light and color I love the D800 but it is mentioned that the DR is not that great, cost slightly more and the auto focus seems a tad slower. So I am kind of lost from there on, then come people who thinks that training I should get DX then FX, some say it is ok to do FX lens Dx body but I also read that doing that often get problem with sharpness and colour.
Obviously if I have money one set of each will be awesome but nope, I am not there yet and not soon enough to even consider so I trying to find a balance between upgrade path cost and ease. Granted that lens do retain value but trying to sell it is not that easy either.
I am just not sure why is there a need to learn at DX level before going to FX or the reason for that is to be able to appreciate the strength and weakness of FX and DX at the same time?
Disclaimer my next statement, please do not view it as a brand war, I just stating what I observe and if it is wrong please correct me without turning this into a flame war.
D800 vs 5D Mark 3 --> This is not so obvious, since each is a good camera for their own purpose but my gut feel make me think that D800 = specialized solid performer that can rival medium format while 5D is like jack of all trade, decent for everything but not stellar in any given area. Just static picture, I am not interested in the video stuff.
D7000 vs 60D --> this combination seems to be a mismatch since D7000 seems to be king easily but I might be wrong of comparing with the wrong model then again it might be age different
Another thing to clarify, I know that canon can take nikon lens with an adapter but does it affects its performance?