Myth busting time. Yes the GH2 really can do clean, detailed ISO 12,800 in low light, and it is the best current DSLR for low light shooting, with an organic fine grain noise pattern like the Canon C300. It all depends on picture profiles, as EOSHD shows in this video tutorial.
See how to create videos like this and get the most out of your GH2 with the EOSHD GH2 Shooter's Guide. A 164 page book by Andrew Reid eoshd.com/gh2-guide-book