If the point of showing an image is to show how good, or bad, the high ISO performance is, then I would expect no Noise Reduction to be applied. I can compare a similar image of mine at the same ISO (if my camera were to go to such high ISO levels

) or see what level of my noise matches any posted images. Otherwise, as mentioned above, it is just this is how high I can push the ISO and still get a usable image. Without a before and after, it could just be a demonstration of your NR software, and how well you can use it.
My camera can only go up to ISO 3200, and I try not to go past ISO 800 if I can help it. ISO 12,800, even if it is with NR, is very impressive. Without NR would give me a more accurate comparison though.