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Yes Mark, the higher voltage battery snaps the AF into place in about .1-sec. with either TC on and even at f/8. In contrast, the 5D3 might take up to a full second and not stay locked on as steady. With no TCs, the 5D3 is almost as fast.
From what I've read from others that have tried the 1D X, you want the 1D IV is you're looking to save some money and still get some of the benefit of the higher voltage battery. I've read that the 1D X is faster, but the IV is faster than the 5D3.
I really think that the 1D X only makes sense for those that need the performance with TCs or need the better weatherproofing or need the higher shutter durability or 12-fps. I plan to keep using the 5D3 as my backup nature body and primary travel and general photography body.
Dave
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