X-H1 has very good exposure range.
Not quite like a modern Sony, but very good.
Much more noise than modern sensors, tho.
The Sirui 23 1.2 isn't the sharpest lens wide open. Good from 5.6, but never tack sharp.
But who wants sharp when you are mostly using it for dog portraits.
We've other lenses if we want sharp.
I am curious how it will look with video, tho.