Necro! First...Steamroller will be out in 2013. Second, Vishera performs very well vs 3770K in many cases. In gaming, it depends on the game, but it STILL can perform as well as 3770K. In other games it simply gets beat by Intel by a decent margin, but at the same time, if 3770K plays a game at 100fps, and FX8350 plays a game at 70fps, it's STILL going to be playing the game faster than your eyes can process, so both chips are satisfactory. Also, the FX8350 is $189 vs $329 for 3770K.
I personally like the AMD for price/performance. However, there is no information on whether or not there will be an AM3+ Steamroller and it's only a couple months away for Haswell. I personally like Haswell very much. The improvements made over IB are nice. If I were you and you are comparing Vishera to Haswell...I'd choose Haswell for sure.
I personally am waiting for AMD to verify Steamroller FX before I build a new system. If they do, I'm waiting for SR, if not, I'm getting Haswell. You should really compare those two instead of Vishera.
If this response is much too late and you already bought the CPU...grats and hopefully AMD does release SR for AM3+. kbai.