Ehh maybe - I don't know if it makes sense to PvP with a holy trinity group.... WoW PvP is all about burst damage and dealing with micro level effects and counters. Not sure a "traditional" 5 box group would have the physical ability to pay attention to everything that is going on to excel.

But I can be wrong and I bet somebody is out there doing it.

I just have to think how hard it would be and how easier it would be to do it in other ways.