I'll answer this with two examples. Both straight conversions from the RAW
Absolutely no editing.
My take is that when viewed as a whole the noise is perfectly acceptable at IS0 4000 less so at ISO 10,000
1
this is the whole image the previously attached Robin is from
Unprocessed Robin by
Trevor, on Flickr
2
This a grab from a high shutter speed burst at ISO 10,000
Unprocessed sparrow IS0 10000 by
Trevor, on Flickr
Fair to say i returned to Full Frame end 2018
I was disappointed at High ISO picture quality from my X-H1
Since then I've had a lot of gear including several other Fuji
The X-H2S is the best high ISO APS-C camera I've owned.