Because I wanted to see how it compared to the FX line up as it stands.
The FX line up appears to be absolutely terrible with Blender by the results here, the 8C 8T PD chips perform at basically half a 4C/8T Haswell, which is absolutely terrible.
I think that Zen must just be that much faster (assuming there isn't something different with their benchmark config). If you observe this benchmark:
http://www.tomshardware.co.uk/core-i7-4770k-haswell-review,review-32699-14.html
Then a stock 8350 is about 25% slower than a 4770k.
Having said that, the same scene renders in 20 seconds on my GTX 970 .