But these high ISO examples are not realistic at all.
The photo of your daughter with headphones is taken at F9! There was a TON of light available to use.
The subway example is closest to a realistic example with a 1/60 shutter and F4. But even here, the subject is lit and you are in close quarters. Light is above and being bounced from nearly 360 degrees around the subject. The subject's head is less than 3ft from a light source.
The others are using flash and F8 - F9! Of COURSE the ISO performance is going to be acceptable if you can shoot at those apertures.
I want to see these ISO 3200 where you are at F1.8 or F2.0 and struggling to get a decent shutter speed and with only ambient to work with. That is where the true measure of the cameras ISO performance comes in.
Trying to shoot your kid in a school play, when you're 100ft back, the auditorium is pitch black except for the stage lights, and you need ISO 3200 or 6400 just to get a 1/60th shutter speed.
Or your kid is on a soccer field at night. Or in a baseball or softball game under sodium lights, and you need ISO 6400 to get 1/30 of a second, so you have to shoot half a stop to two stops under. How's the camera performing then? I know what it looks like under those conditions. I've shot it.
I shot a college soccer tournament where I needed ISO 12,800 just to get 1/400 at F2.8. I shot it on the D3s and it still looked very rough, and I had to try to clean it up enough to sell 8x12s. A D7100 or D7000 would not have produced anything that could be used outside of a thumbnail.