Thanks Josef! I'll try the noise removal software in Resolve for sure!

Do you have any shots with another lens?
I've been using the C100 MK2 for over a year now and can't say I've had this issue. I've also tried the combo that you are using, the Sigma Art 18-35mm and I loved that lens for both wides and close ups.
You can try to add some sharpening in post (I usually use Unsharp Mask when working in Premiere Pro) but I'd like to see a test with another lens to rule out that option.

Another question: Do you use any filters in front of the lens? Low quality or cheap ND filters or plain UV filters would kill the quality of both the lens and camera.

Thanks Jack!

Thank you Liam! I did have a suspicion that the 320ISO was an issue as well, but wasn't sure. Great to get some insight from other C100 users!

Thanks Walter!
I was actually thinking of doing some tests comparing C-Log and Wide-DR around this issue, because I've never noticed it this bad when I've done shoots for clients that has been outside. Reason being is because most of it has been fast turnaround projects, so I've used wideDR instead.

Might have to try it and see how I go.

Hi Joseph! Thanks for a great answer. Just a question as colour grading is probably my least experienced area: How would you go about adding grain to the canon log? Do I need plug ins or would it work with stock files to add on top?