Canon image quality/rendering
I can't remember when I last shot a jpg, I shoot everything in RAW But unless you keep your camera always within the "safe limits", you will encounter an image with synch a high dynamic range or such low light, that it will inevitably leave you with a choice of having noise in your images, or having unusable images left flat, mushy and liveless by excess NR. In those images, you can see the quality of the noise.
Again, In post my NR workflow leaves the "quality" of noise pretty much brand independent and more a model factor than anything else.
My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)