First video testing low-light and recording on the Nokia Lumia 920
I know many readers are not yet impressed with the Lumia 920 compared with the Nokia 808 Pureview, but I think this short video by Glenn Ruysschaert might impress you nevertheless.
No, the sound is not stereo - in fact, I don'think Nokia calls it "rich recording" at all for that reason - but nevertheless compression and balance are remarkably well! Also, video is very stable and there's not much you can say about this low-light performance, in my opinion.
But go check it out for yourself and let me know what you think! :-)