So during my lunch time. I walked over to the Apple Store, 2nd time this week, with my X3 + 7520 to compare it to the P7, H6, and even the Beats Studio.
7520 curb-stomped all of them with ease. LOL. I gave each one a long good listen with multiple tracks, making sure to check the fit and seal. I didn't want to not give them a fair chance at it.
I sort of hesitated posting of my 1st walk over, because I wanted to give all three of them a chance once more, but thought I would share this time. Keep in mind though that the Apple Store during lunch time isn't exactly the quietest place.
Funny thing, but true is that the Beats Studio sounded better than the P7, and H6. Overall that is. There were things the P7 did better but overall the Beats won. Which is just really sad...
Did you try Beats Pro and compare it with MDR-7520?
Some said Beats Pro sounds the best among the Beats Headphones.