lol to be honest, I own both although I have far more experience with Amd. It wasnt until the e2140, e8400 release that I jumped ship from good old socket 939. Using an 650iultra was the first time I hit over 4ghz !!! Then when the athlon x4 620 came about I jumped ship as it spanked my 8400 in encoding.
Over a year later I upgraded my dads 754 newcastle to an x2 555 + new board.
Upon discovery that the x2 unclocked and clocked like a bad boy, I swapped my athlon with the x4 b55 into my 770ud3 am2+ with ddr2. This board and my ram lasted me from my intel build (reusing ram from intel setuo) all the way unti I then bought my sandy last year (2-3 years) ! So It's great that amd included 2 memory controllers.
Anyway I planned to buy an 2500k, they had none in stock so i bought a 2600k.
It runs using offset so max v-core is 1.37, and i clock it to 4.5 with power savings on, Using a titan fenrir it runs so cool max 63c core, doesnt make my psu squeal and encoding which is moslty what i use my pc for it is just so much faster than my 4.2 2750nb x4 b55.
In gaming comparing the 2600k at 1920, there were some games that the intel played better and some games where there was little difference. This was using a 6950 1536 940/1375.
Since then a few more games have come about that make use of more cores etc, I'd like to buy an old am3 board and borrow my dads/ my old x4 b55. I'd like to see how bf3 runs at ultra with no aa vs my sandy bridge on multiplayer. I've heard the rumours but most people dont overclock the phenom II properly, they just run 18/20x200 and call it a day.
Anyway i'm no fan boy I buy for the best value, the x4 620 clocked was a massive leap from my e8400 for my purposes. The same for the 2600k vs the x4 b55.