Intel decided to refresh the dying and aged 1366 platform, so they refreshed their banking accounts with your well earned money and give you in return meh gains. The only thing good about the X79's are the Motherboard features, which incidently AMD have been offering for well cheaper for sometime.
A 2600K is very comparible with the SB-e chips, maybe 10% slower worst case scenario, SB-e like Bulldozer = avoid at all cost unless you are a sugar daddy or have a sugar daddy, in which case you can buy me one as well.