The A7 III gains a significant update to its autofocus because it features a very similar system to the one found on the flagship A9. The camera sports A9 AF and A7R III performance for just $2000 (Amazon | B&H Photo Video | Adorama).
So this is an amazing result for a entry-level full frame camera that costs a lot less than both the A7rIII and A9. See also : Sony a7 III Has Better Dynamic Range and High ISO Performance than a7 II.
Sony A7 III Sensor Review : Scored 96 Points Close to A7R III
Sony a7 III Vs. Canon EOS 6D Mark II Vs. Nikon D750:
So where to find Sony A7 III camera in stock? Here is an in stock / availability tracker for Sony A7 III mirrorless camera. Check Sony a7 III Sample Images, Download User’s Manual or read more Sony Mirrorless news and Sony Rumors here.