Photons to Photos published their final Sony a7RIII results and the Mark 3 is indeed a very slight improvement over the Sony a7RII. You can manipulate the results here if you wish, but of real interest is the big round-up of 40-50MP cameras, where the Sony a7RIII edges out the Nikon D850 at base ISO as you can see below. When comparing the Sony a7RIII vs Nikon D850 vs Fujifilm GFX vs Canon 5D Mark IV the Sony a7RIII is only bested by the Fujifilm GFX 50S. You can manipulate this roundup here.
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Sony a7RIII: B&H Photo / Amazon / Adorama
Sony 24-105mm: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama
Nikon D850: B&H Photo / Amazon / Adorama
Canon 5D Mark IV: B&H Photo / Amazon / Adorama