There is no comparison, been using a 1D Mk3 for several years now, for everything from sport to weddings. I also have a 30D which sits on the shelf at home and two 40Ds one as a back up the other my wife uses.
I seldom use the 40D, the 1D is way ahead of the rest, on focusing, down load rate, FPS, buffer size, focal points etc. The 1.3 drop is not a disadvantage either, I often use a 70 - 200 for sport work and return good results.
Saying this I am investing in a 1DS Mk3 at the end of the year and 2 5D Mk2s, but only for our wedding work for which they are more suited. If funds allow, I will be upgrading to the 1D MkIV in due course, once the lumps have been ironed out.
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