Here are some  MAX benchmarks:

8350

http://www.xbitlabs.com/articles/cpu/display/amd-fx-8350_7.html

 3930K

http://www.xbitlabs.com/articles/cpu/display/core-i7-3820_7.html

 

The i7 is significantly faster in these tests.  The performance/dollar will be the deciding factor in your judgement...

 Disclaimer; I have an AMD Phenom II X6 on my render machine...

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