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So far, all the positive of Canon seems only "Adapt more lens".
I will add another good for Nikon:
you can manual enter CPU data. So, the image you take at least have focal length information. I believe it will also make Matrix Meter work. I have to check if I can also make macro focus adjustment, not sure since I never use it.
As for Focus confirmation accuracy:
I did some test between D800E and D700, there is no noticeable improvement.
So I guess either 5DII must be really bad or 5DIII figure out some way to improve it. (seems even in that thread, some people report no improvement.) How? If you tell me out focus point improved upon 5dII, I will believe, but center also improved? I'd like to know.
For Nikon, I do find go from near to infinity and slightly pass confirmation dot work the best for me. It seems opposite way report by mco_970. Though I feel back DOF always should be more than front DOF, thus, focus from close to infinity seems make more sense, or maybe just the way Canon implemented? (mco_970, have you check if all your manual lens work that way? it might lead some macro adjustment.)
Even though the focus confirmation dot has a some range of solid, I can never say it useless for me. You just need experiment it a little and understand your lens well so that you know how much you need pass that dot depend on focal length and distance. I know it is sound painful, but a lot better than mis-focused images, especially with lens has focus shift.
I have found that once distance get longer, DOF deeper, even though focus confirmation accuracy get worse, it seems still perform better than my eye even with f1.4 screen.
Luka, Yes I forget D600, though I seems slightly prefer Nikon's sensor than Sony's based on my experience with D800 and NEX-7 for portrait. (I might need a better profile, but I feel D700's color very stable over different light condition, I don't need tweak hue, satiation most of the time to my taste.)
Can you tell me which Contax lens you convert to Nikon? I am very interested.
I think I might just stay with Nikon for a while.