When is a picture sharp? I really dont know if my images are sharp and its making me angry. My lenses should be quite accurate and I have found f/9 to get me the sharpest focus on my subject, but for some reason I am still unsure once the pictures have been uploaded to my PC.

For darktable users here, at what zoom percentage is unsharp for you? I start having an sharpness issues at 150%-200% zoomed in. I have never been able to pixel peep at 400%.
Also when checking for sharpness do you look at the RAW or the JPG in post processing? When I toggle focus peaking usually the jpg has more highlighted areas, maybe due to compression, not sure.

I am using a Canon 90D with Sigma and Tamron lenses.
Lastly, I am also using high iso noise reduction on the 90D having always thought it would benefit me, but look at my camera LCD on pictures taken with and without this setting on a tripod at 100 ISO it seems this setting slightly effects the picture at 100 ISO making the grass in the distance not as pointy/ prominent as I would like it.

Here an example with birds SOOC and uploaded in original to filebin:
https://filebin.net/aflr5zu1xgupmdyi