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Micro-sensor decimal-orgy when TS looks for full-frame. Huh.
But when it comes to Sony FF vs Canon FF. Sorry but I cant see how A900 matches the 5D2 in any respect. Doesnt it lack both liveview and video, and can you change the matte to a fast one (factory supported)? It's a 30€ easy switch for a 5D2. MF is o interest here, and I fail to flush away the ancient feel the A900 steams compared to the 5D2 right there. And then comes ease of adaptability, Sony may be better than Nikon, but both worse than Canon.
The one thing I see is IBIS, but in my experience that is only useful for longer focal lengths which is not what typical MF fans do a whole lot of. The sensor doesnt impress either, as opposed to current generation sensors from Sony such as in the A99 or D600/D800. I'd prefer the 5D2's over what noise I've seen from the A900, but maybe that's just a matter of what you're used to and what tools are available for RAW files between the brands.
Finally, with ML the 5D2 de-aged a couple of years for people interested in focus peaking and such. It also brings a number of other things too, one-click full magnification of screen (LV) and also can impose a small magnified view in the LCD when that is suitable. You can even configure it to a simulated split screen if you want.