Like I said in my post, I'd most likely be happy with either system. I'm looking forward o seeing what An Exception does with his 35mm, when I was looking to change to Nikon earlier in the year I found mixed info on it. I don't see the f1.2 50mm and 85mm lenses as niche at all.
35's Nikon is sharper but focuses slower (but apparently more accurately).
50's Nikon's 1.4 isn't very sharp wide open, IQ and focus speed isn't as good as the 50 1.8g overall. Canon's 50 goes to 1.2, but isn't that sharp wide open and suffers focus shift (which apparently is why allot of people prefer to use the 35 instead).
85's Nikon's doesn't go to 1.2 like Canon, so it's 0.3 stops slower. Not sure if you can really notice 0.3 stops in aperture difference that much, but it's still advantage to Canon. Apparently Nikon has an AF speed advantage, and considering that Nikon's 85 is a hair faster than it's 35, the 85L must be
very slow. Having enjoyed a pretty fast in comparison Sigma 85, that's also tack sharp at 1.4, I would be very hesitant in swapping it out for either the Canon or Nikon. The main reason for swapping it out for Nikon's would be for the weather sealing, and the Nikon badge, but in practical terms of usability other than in rain, I feel this would be an overall downgrade due to the slower AF.
This brings me on to the screw drive AF system. It would have been great if there was an option on the new lenses to choose AFS or instead screw-drive AF from the body.
The reason is while AFS is quieter than SD, from my experience is super fast compared to comparable AFS lenses and also very accurate. I assume this is because the motor in the camera has much more beef to it. My old 85 1.8D was so fast at locking focus on whatever I pointed it at, even in dark conditions, as soon as I pressed the shutter, it had focused and released the shutter with no perceptible delay. I'm not exaggerating, that lens was
fast, same went for my 50 1.4 and still does for my 24, however I hear the 85 1.4D was a bit of a AF stinker.
As for Zooms Vs Zooms, I don't really pay much interest as I like primes, however once I'v got myself a second D700 and saved up again, next on my list may be the 14-24 2.8, to replace my 24mm 2.8, it's a little extra weight so I still deciding weather to just get a 20mm 2.8 instead.
Then, I will be saving for a pair of D800E's...