DxOMark has tested the recently announced Sony a7 III (B&H/Adorama/Amazon), the DxOMark score is 96, one of the top DxOMark score in camera database. Below is a comparison of Sony a7 III against Sony a7R III, a9 and other related cameras.
Sony a7 III Vs. Sony a7R III Vs. Sony a9:
Sony a7 III Vs. Canon EOS 6D Mark II Vs. Nikon D750:
via: DxOMark