I also plan to upgrade to the 5D Mark3 within a few months, if that makes any difference...
Yes it does make a difference. The 5D3 will greatly improve your chances with fast manuals and also with "super" fast auto such as 1.2's without needing to use LV all the time simply because the viewfinder's green dot focus confirmation is that much reliable in that camera.
I pondered more or less around the same question as you and decided the following for myself:
-50mm: discarded the 50l and Zeiss 1.4 went for the Zeiss Makro Planar F/2 because it is outstanding at any aperture and a joy to hold and use. Top build and frankly a stellar performer wide open at f/2 with macro capability (well, 1:2 but macro anyway). The 50L has only going for it the 1.2 aperture and from what I read it is not very sharp there. Look on the forums for examples of the Zeiss 50MP's bokeh and even at f2 it can compete handsomely with the 50L at 1.2. And the famous/infameous 3D effect: oh boy does the Zeiss 50MP render in 3D
-85mm: went for the 85L: besides being very very sharp at 1.2, my experience with the Zeiss 100 (which I also own) is that it is very very difficult to nail focus in manual at those king of apertures with medium teles such as those. The the autofocus becomes a necessity. I still use the 100 MP but for those occasions I KNOW i'll have the time to take n-pictures until hopefully one is critically focused. If you wonder why did I chose a fast manual 50mm such as the Zeiss 50MP, I can tell you that manually focusing at f2 at 50mm is much much easier than doing it at 85 (exit the Zeiss 85 1.4 then).
Here some examples of the "pop" effect, bokeh, shaprness and particular contrasty colors of the Zeiss 50MP (Heck I've even had to desaturate some). You'll finder bigger on the flicker page where I put them.
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Fegarix, sur Flickr
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Fegarix, sur Flickr
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Fegarix, sur Flickr
And a couple of "3d" examples (though need to be appreciatted better in a bigger pic:
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Fegarix, sur Flickr
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Fegarix, sur Flickr
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Fegarix, sur Flickr