Nikon released a major firmare update v2 for the Nikon Z6 and Z7 full frame mirrorless cameras which adds Eye-detection AF and improve low-light AF performance. Here is the read world comparison review of Nikon Z6 Vs. Sony a7 III Vs. Canon EOS R on Eye AF performance.
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Read full post here:
https://www.dailycameranews.com/2019/05/nikon-eye-af-firmware-v2-vs-sony-a7-iii-and-canon-eos-r/