dpreview compared the Eye AF feature on Sony a7R III and Nikon Z7 at the CP+ show 2019. It seems Sony a7R III‘s eye AF is more accurate than Nikon Z7, and a7R III can detect eyes from further away.
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Tony Northrup has just published a full comparison video of Sony a9, a7R III, a7 III, Canon EOS R, Nikon Z7, Fujifilm X-T3 for sports photography. According to Tony, for the full frame mirrorless cameras, a9, a7R III, a7 III are better than Canon EOS R and Nikon Z7 for sports photography.
Photons to Photos has added Canon EOS R and Nikon Z7 to their database. Here is a read noise comparison on Sony a7R III (Amazon/B&H Photo/Adorama/Focus Camera) with Canon EOS R and Nikon Z7, from the result we can see that Sony a7R III has less noise overall that Canon EOS R and Nikon Z7.