To be honest, I own Canon 5D Mark II and I am deeply impressed by the spec of D800. Nikon put so many advance features of their flagship camera D4 into this D800.
So I think now Nikon has separated D4 and D800 like this:
- Sports -> D4
- Studio portrait, landscape -> D800
I initially also interested in NEX7. But I read some reports and user comment that the noise at high ISO in NEX7 is high. And consider the fact that NEX7 is definitely not cheap.