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The grain on the x-t4 is slightly more than the a7iii, but honestly, no-one cares at that level, I’ve been shooting stuff at 6400 recently and no client has complained, probably due to the Fuji colours are so nice.
And whilst yes, the higher iso performance is better on the Sony, you make up for it in Fuji’s excellent (and cheap) lenses, so you can shoot 1.4 getting more light.
Sigma have just announced some Fuji primes which are stupidly cheap.
Alas, all my kit is gone, just set of hahnel wireless remotes for Sony left if you’re interested?
I will say though, loving Fuji and not missing Sony in the slightest.