Nice Romy, my results come out to be very close to yours as well on the one raw. Here is a really quick run though, nothing very elaborate, no masks, etc. I think I tried to hard to bring the detail out, but we are really only looking at the noise for this example, i believe.
Here are 4 of my raws from recent shoots at ISOs > 800 (a couple at 1250 and a couple at 3200), since it seems nobody ever posts unadulterated raw images and just processed websized images (even though through the years, I have posted many 100% cropped untouched images, then the post processed images, especially in the tutorial thread over on POTN).
See what you think compared to what others have posted, and let\'s see your handiwork on polishing these turds.