Photons to Photos added the Canon EOS R and Nikon Z7 to their signal to noise ratio database. You can manipulate the data here and the Sony a7RIII does very well against Canon and Nikon’s new offerings. The Nikon and Canon data is based on pre-production cameras and might improve later so stay tuned.
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Nikon Z6 Z7 Mirrorless Cameras Group
Sony a7RIII: B&H Photo / Amazon / Adorama
Nikon Z7: B&H Photo / Amazon / Adorama
Nikon Z6: B&H Photo / Amazon / Adorama
Canon EOS R: B&H Photo / Amazon / Adorama