I decided to make this just so people unaware of how PvP power and PvP resilience works could be informed. Personally on my server I see the vast majority of players gemming full pvp power assuming they are perfectly balanced stats. I just wanted to shed a little light on the subject.
PvP Power Gemming PvP Resilience Gemming 56.62% -> 67.56% 65.30% -> 69.18% 1.5662x -> 1.6756x 0.347x -> 0.3082x 10k hit becomes 10k hit becomes 15,662 -> 16,756 3,470 -> 3,082 6.985% increased damage 12.589% increased damage reduction
This was done in full Tyrannical gear on Patch 5.3 PTR - Build 16781 and the new build 16790 does not seem to change anything.
Both tests are using the 200 resil Chest Enchant as it is baseline for pvp either way.
Note that a 12.6% damage reduction also means that you will be able to play more offensively than otherwise, which may or may not equate to the 7% damage gain in the end.
On another note, it appears that ,even after the changes to resilience and PvP power, resilience will still be the more optimal choice of gemming in 5.3. I find this to be a good thing as otherwise pvp may have became even more bursty than it currently is .