About Maxwell bench:

As a bench is not that AMD-friendly: keithlm scores 367.249 w/ his FX-8350 @ 4.8Ghz + DDR3-2133, while a Maxwell user, Filip Filipovi4, scores 411.03 w/ his i7-2600K at the same 4.8GHz / DDR3-2133.
So, 2600K has ~12% better performance over FX-8350 here.

Now, in real world 3D apps as Superkames has already showed us in September, FX-8350 is 7% better than 2600K in 3dsmax 2011 + Vray 1.5SP5 and is up to 8.5% better than 2600K in Cinema4D R13.

So, we are talking of about 20% of difference in perfomance between Maxwell bench and real world 3D apps when comparing 8350 vs. 2600K ....