I also have the xorg-edgers ppa enabled and all the latest from there. This is my software stack:
OS: Ubuntu 13.04, Kernel: 3.10.0-994-generic (x86_64), Desktop: KDE 4.10.5, Display Server: X Server 1.13.4, Display Driver: intel 2.21.11, OpenGL: 3.1 Mesa 9.2.0-devel, Compiler: GCC 4.7, File-System: ext4, Screen Resolution: 1920x1080
Otherwise, the i4670k is rocking my world. Paired with a z87 mobo and 2400 MHZ RAM it is screaming fast:
I'm running ivy bridge (3570k) but I was using a discrete gpu until recently so I didn't understand how awesome their integrated gpu had become, I'm using it now and I'm completely blown away. I don't really game much anymore and intel's linux support is so good that I can't imagine using anything else now. I'll admit I'm a little jealous of those who have the latest gen but I don't regret buying when I did, hopefully in a few more iterations I'll be blown away again.