DPR added the Sony a7SIII to its studio comparison tool the other day. The results are certainly not what I would expect to see since the Sony a7RIV seems to control noise better or as well as the a7SIII at 102,400 in some parts of the studio scene. There are certainly other parts where the a7RIV losses a lot of detail and the a7SIII shines, but the a7RIV compares shockingly well in my option. You can see for yourself here.
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Sony a7SIII: B&H Photo / Amazon / Moment / Adorama
Atomos NINJA V: B&H Photo / Amazon / Adorama