I post the following not to pass judgement but to make available for -you- to pass judgement. I have 4 High ISO jpegs with the noise reduction at it's lowest setting. You can open each to full full screen or download yourself and check out closer.
I also have 2 images in both jpeg and RAW for you to check out. Although good luck in finding a program that can see the RAW file. Lightroom cannot, but there may be a couple out there that can.
Click each to open up larger. Or right click and download yourself.
The above was gathered from the Spanish website Quesabesde