Okay I figured it out. DRO was off but it seams gamma specifically in picture profiles messes up exposure. PP itself should have no impact on RAWs but only gamma inside PP plays a role so after switching PP off from PP8 (slog3 where gamma is different than PP off on default) I was able to get same exposed RAWs as when shot which is how it should be. So Picture profile was to blame. Thanks for all advices lads and hopefully this will serve someone with similar issue
Thomas Horvat got a reaction from 2WheelsGood in A7SIII RAW are darker by 2 stops in Adobe PS and LR