Good thread, lots of info and input. Even some conspiracy theory.
4-core 3820 on skt 2011 with X79 uses more power and runs hotter compared with 4-core 3770k on skt 1155 with x7x, but can use more memory and enjoy higher memory bandwidth (4-channel vs. 2-channel). which may matter in some DAW usage scenarios which can be memory constrained on skt 1155.
3820 might make sense for users who need more power than available with earlier X58 platform with 3-channel memory but can't afford the higher priced 393x skt 2011 6-core processors (although 3930k pricing appears to be dropping finally).
Although, with the memory controller being integrated on skt 1155 as well, 3770k might be a better "sweet spot" upgrade in many cases at rather lower cost than 3820/X79, if the lower memory capacity/bandwidth and performance isn't a constraint. And 3770k offers integrated graphics, not available on skt 2011.
Scott's recent AMD FX Vishera benchmarking may be of interest here:
http://www.gearslutz.com/...y-have-eat-my-hat.html