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Good points. If you are on the verge of an upgrade you also have 2 other options.
Nikon D600 rumoured to be 24mp, full frame, similar autofocus etc to D800 and around $1500! I'd say its not long to wait for that one as its been rumoured with leaked photos for some time now.
Canon bringing out a full frame for around $1999 shortly (Photokina which I think is in the later part of the year).
Later in the year perhap Canon is supposedly working on a 40+mp camera to match the D800 better.
As far as high ISO low noise Nikon D800 is equal to or better than 5D3 in RAW. In jpeg Canon uses an aggressive luminousity noise reduction that works well but gives an artifical look to the images (some may like that).
So you can shoot higher but you could do the same with the D800 and use Noise Ninja or noise reduction in post processing to achieve similar. So no winner there but the wider dynamic range of the D800 is very relevant to astro where shadows can be lifted with little noise and no banding whatsoever which can plague some Canon shots at low and very high ISO.
For astro work, 36mp is not realy relevant as the images are so massively downsized and its all about noise and amp glow etc. I think either camera is the go there or perhaps Nikon D4 or Canon 1DX.
To me either camera would be very good (5D3 or D800/E). Only D800E offers no AA filter. You would hardly be upset with either choice. It boils down to better resolution and wider dynamic range and no AA choice for Nikon and high ISO smoother jpegs, slightly better autofocus, better video for Canon. Canon's 5D3 was evolutionary and a very polished camera. Nikon's was a large jump like 5D2 was.
Greg.
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