This is based on a shot from tinyurl.com/3xjapt, that seemed irretrievably overexposed. With a little a photoshopping, it doesn't look that bad. Noise reduction wasn't used.
The translated page states that it was taken @ 6400, the exif data states that it was taken with a D300. Adobe Info shows High Gain =2. Could be real.
Hmmm....looking good for Nikon, if this is believable.
The lesson learned here is that a fill light will help you minimize noise at high ISOs, but only in the foreground. You can also get away with a slower shutter speed to get a lighter background. I've done it in the past at some restaurants, and I'll probably shoot some new examples to show what I'm talking about.
The strobe technique could be a lot better in this shot. It could have been another photog's flash caught coincidentally.