Socket 1366 with i7 980( 583$) and i7 980X and 990X(999$) are high end not 2600K.
i7 980X was launch on Q1 2010 http://ark.intel.com/products/47932/...GTs-Intel-QPI), so after 1 year and a half AMD doesn't even touch that performance in multithread.
BD with "8core" should have been between 2600K an i7 980 in multithread always and closer to the six core Intel than to 2600K to be a very good cpu.