My test build shows:
1) 9006 crit damage against character in +15 set without PvP
2) 8705 crit damage against character in +15 set with PvP
In may look like nothing, but it's a 3.3% less damage. And extra HP. When a lot of things give you here extra %, there extra %, somewhere else also find extra%. And after summarising - it will look good.