ASUS P8-Z77V Pro Sandy Bridge Review
It's becoming pretty clear that, at least if you're planning to stick with your current LGA1155 processor, the Z77 doesn't give you any particular reason to upgrade so far. CineBench R11.5 replicates the results we've seen so far from AIDA and Sandra.
Finally we see an improvement and it's POV-Ray that provides it. The P8 Z77V Pro with the i5-2500K at stock manages to outperform our result with a P67 motherboard. One thing of note is how well each individual core performs (the Per CPU result) when compared to the threaded processors that make up the rest of the graph. Over double the performance you're getting from each core of an i7-3960X. Indeed your extra 8 threads don't even double the i5-2500K result.