Mastery 6/7 Don't Feel Much Different in Game
When I went from Lvl 4 Mastery to Lvl 5, I felt a big change in the Mastery Emote. It's much grander and the noise is much different; however, Mastery 6 and 7 don't feel like they are much different than 5 to be honest. Yes, they do look a little different and sound a little different, but not to the point they're easily distinguishable.