I have had my 2700k@ 4.6ghz for over 2 yrs now and still cant justify upgrading as yet. It seems i may get something like 5% increase in games. All games currently run very smooth, so to buy new mobo, cpu, ram for 5% just doesnt cut it.
When i can see over 15%-20% increase I will consider a CPU upgrade, I'll have to wait for some benchmarks.
I already had a 2600k that stably hits 5.2Ghz on air, imagine my disappointment when my 3770k topped out at 4.8Ghz on air.You are a wise man for waiting, Sandy Bridge, was the best upgrade I ever had (from a 1090t). I'm very hopeful that with IPC improvements and at least a 5.2Ghz OC on DC will bring that feeling back.