I will say one thing for Canon shooters, at least if Canon doesn't make a lens for it you can get an adaptor to use a Nikon lens. I have seen several 14-24mm Nikons lenses mounted on a Canon body. I think it only works with the newer AF-S Nikon lenses, but I don't know; I just can't see the adaptors being able to use the screw drive.
Your question about the 35L, I assume this is the 35mm 1.4L lens from Canon. Nikon released its 35mm 1.4 with in the past 2 years I think. It was released with the 24mm 1.4 and the 85mm 1.4. Some have refered to this as the new trinity set to get, I would have to assume that the 35mm Nikon version is pretty good.
Besides the 35L do you have any other Canon glass that would hold you back? I will add sometimes its just not the camera and the glass to go with it but think about flashes and any other items you use on a normal basis that are brand specific (pocket wizzards, ect, ect).
I guess I am waiting on a rewiew as well but on this one its Nikon agaist Nikon, the D800 Vs the D800e. I like options but geez I want a crystal ball to tell me which one would suit me best.