I think the a 2600k is well within reach of the 8 core Bulldozer, especially if you consider multitasking and multithreated apps.
If Bulldozer beats the 2600k by just 5pct, it still loses to 980x. And that's decent but no a spectacular achievement.
I expect BD to fall between 980x and 2600k and I don't think that is overhyping for an 8 core 3.4 ghz chip.