Not sure why you are replying to my post on the MPIX difference with Cicala's evaluation of the 5DIII - but whatever...The 22MP 5D Mark III was effectively the "1Ds Mark IV" without the integrated grip and larger battery. It was introduced in 2012, the same year the 18MP FF 1D X replaced the 16MP APS-H 1D Mark IV and the 21MP FF 1Ds Mark III was discontinued.
The 5D Mark II had a Rebel level AF system that was one of the most inconsistent Canon has ever put in a DSLR.
The 5D Mark III had a pro level AF system that was very close to the one in the 1D X. They even used the same part number for the PDAF sensor array, just different firmware.
At the above linked blog article Roger Cicala of lensrentals.com said about the 5D mark III:
The difference between the 5D Mark II and 5D Mark III was not resolution, it was AF and other features that make a significant difference to pro shooters.
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