Based on the spec list, it won't have 'the same AF' since the tracking capabilities of the 1D X use data from the 100K pixel RGB metering sensor, and the 5DIII is not getting that, but rather the 63-zone iFCL metering found in the T3i/600D, 60D, and 7D.Originally Posted by Sheiky
Good point. If it turns out it is: what would the 1DX have that justifies the enormous price-difference over the 5D3?
As to what justifies the price difference, there's not nearly the gap that existed between the 5DII and 1DsIII, and that's a good thing. The 1D X has faster fps, better build and sealing (the 5DIII will likely be to 7D standards, good but not the best), better metering, likely a higher flash sync speed (1/250 s vs. 1/200 s, I'd guess, but no specs on that yet), spot metering linked to any AF point, one more ISO stop, well over double the shutter durability, two CF card slots (vs. 1 CF + 1 SD), and also likely the customizability of the 1-series.
As an example of the latter, when shooting with a wide lens (e.g. 35L) in Av mode, the camera will allow the shutter speed to fall to 1/30 s which is too slow for people moving, so I'd rather it bump ISO instead. With a 1-series, you can set up min/max values for shutter speed, aperture, and ISO to suit various situations.
Personally, I've got some serious thinking to do... The 5DIII is most of want I want from the 1D X, and half the price. I can afford the 1D X, but $3K to spend on other stuff (24-70mm f/2.8L II?) would be nice...
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