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Well, today manufacturers simply hope that every RAW developer has NR switched on and customers wont go under these values.
If you start using something DCraw based, you are going to get nasty suprise and sudden realisation than most today sensors are pretty much cr*p. There are cams that are truly clean at base ISO, but there isnt exactly plenty of them (mostly FF cams).
But then, what can be expected in this age.
Yea and those GH2 samples - at ISO 800 it has 26.1dB SNR, so it really cant look like this without a lot of NR. Most likely its done directly on RAW in camera, or another hidden auto-correction feature of ACR, which is quite far from "RAW" even if you zero everything.
And AA-less NEX-7 .. well fence is bit more visible. But simply try to shoot something normal (not test) and lets see? Tho you wont see much with regular lens, something Leica/Zeiss/Voigtlaender grade is needed.