TechPowerUp posted a review on the Intel Haswell i5-4670K vs. i7-4770K Comparison
A quote from the article:
We compare the top two Intel Haswell processors Core i5-4670K and Core i7-4770K at stock and overclocked. Ivy Bridge results are included, too, to determine whether an upgrade makes sense. We also did a run with liquid nitrogen, resulting in maximum clocks of over 6 GHz.Intel Haswell i5-4670K vs. i7-4770K Comparison @ techPowerUp