I've always found the proper way to determine the quality of high ISO shots was to see them while shot under less than ideal lighting circumstances. Like a dimly lit room with objects that have fine detail and color varations and/or a reasonable amount of motion in it. This way you can see if the details get muddy and where color noise gets pushed. Outdoors in sufficient lighting never seems to reveal much about high ISO performance to me.
FYI, this was shot indoors at the Nikon booth at Photokina.
EXIF data shows f6.3, 1/400 (@ISO 6400) which is equivalent to f6.3, 1/12 at ISO 200
So the lighting wasn't exactly great.