I have been shooting Canon 20 years now. Had a dozen SLR bodies. This is my jump into mirrorless. This seems high for noise. I processed the crap out of this to reduce the noise down to this. Is it me or should I give Canon a shout? I have had this body 2 weeks. The lens is a 15-35mm. So good glass. The RAW file was worse with noise.
You're really zoomed in there; beyond 100% so the size of the noise is being exaggerated.
This is also at ISO 400. Personally, I don't see any issues.
If you want the lowest noise, use ISO 100.