OP, it's also worth noting the sheer value of item level these days. I have no idea why but stats have never felt more drastic than they have in the past couple of expansions. For some reason 5-10 ilvls can account for ~20-30% more DPS depending on what class you play.
I feel like not enough people notice this and are pointing it out. Why the hell does there need to be such a massive disparity between two players within such a small gap of gear?