I find some of your comments amusing, immature and lacking substance in many ways. It is disappointing to read how some in this forum are attempting to sell others on a different camera manufacturer. This forum is attached to a new Cannon EOS 5D Mark III preview put together by professionals. Actual "hands-on" comparisons are helpful, sales attempts and degrading remarks are not.
Personally, I would choose the Cannon 5D MIII over the Nikon D800, as the electronics in both the Cannon lens' and camera's (when matched together) are currently a notch above Nikon. As for the light leak issue, shortly after this was discovered, Cannon produced a fix and subsequent serial numbers were immediately addressed (as would any reputable camera company fix the problem):
"Concerning the EOS 5D Mark III digital SLR camera, when the LCD panel illuminates in extremely dark environments, the displayed exposure value may change.
In extremely dark environments, if the LCD panel illuminates, the displayed exposure value may change.
Affected ProductCanon EOS 5D Mark III Digital SLR Camera*Products whose sixth digit in the serial number is 1 or 2 are affected. For example, “xxxxx1xxxxxx” or “xxxxx2xxxxxx” ([x] represents any optional number.)"
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