I have the 50/1.2 too. Can't compare it to the 200/2, but I find it less "sterile" than the 105/1.4 although equally sharp. And MUCH MUCH sharper than the 58/1.4 on the focal plane at full aperture, while at the same time retaining many of its qualities (delicate out of focus transitions, natural skin tones, etc). The 58/1.4 is a deeply flawed lens that, due to these flaws, shines with certain subjects (and sucks with others, again due to said flaws), while the 50/1.2 is a technically proficient one that manages to shine with ALL subjects.
I hope the external link works... I am not at home now, so I can't upload directly:
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If the new 85/1.2 will have the same quality PLUS the defocus feature that I so love on my 105 DC, I guess it will be another sure purchase.