The interesting thing with Nikon D3 are the new lenses (14-24, 24-70 and upcoming Tilt/Shift) sadly Canon can not compare with this lenses, so what is the use to wait for a better Canon camera like 5D mark II ? I Have tested these lenses with the D3 myself and I was angry about the poor wide angle performance of Canon before, now I am even more upset, because obviously it is possibly to make good wide angle lenses for digital full frame.
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Don't know when it will happen, but Canon will eventually fix this. It took Nikon years to incorporate AFS tech into more of their lenses, and only recently updated with some new AFS primes and wide zooms, so give Canon a chance, but you might have to wait 5 min....