The 24-megapixel Sony sensor does get pretty close to the performance of the 16-megapixel version. However, on a per-pixel basis the difference is significant. This doesn't matter, except that Chasseur d'Images says the D800 will have per-pixel performance similar to the 24-megapixel DX sensor. I'd have expected something closer to the D7000 pixel performance.
If they had described the D800 sensor as equal to the NEX-7 sensor on a per-area basis I would have no reservations!
But it's possible the Chasseur d'Images writer misinterpreted something he overheard. It's also possible he used the English words "per-pixel" without fully understanding what they mean. He wouldn't be the first to confuse per-pixel, per-area, and per-sensor concepts when comparing image sensors!
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