Cinebench Singlethreaded:
6700K 183
6950XX: 151
That's a 20 percent hit. For this, you pay $1350 more.
Of course, you'll get an impressive boost in multithreaded workloads (1852 in mt cinebench vs 925) But if the work you do can't take advantage of more than 4 cores-- a very common scenario--, you're shelling out big bucks for a slower computer.
I'm not arguing that fast computers are best reserved for a special, elite class of computer user who does more than facebook. I'm arguing that these things involve compromises, and depending on your workload, you could well end up with the short end of the stick.
Don't get me wrong I wouldn't pay that much for that performance difference. My time is valuable, just not that valuable.
What I'm referring to is if AMD is making their 6+ core CPUs their consumer line unlike Intel and their pricing reflects that.