I totally agree that the X2 is less balanced and more forgiving, thus making it a more of an all-rounder. Just like the M50, it's an all-rounder that's fantastic with electronic music.
I got the X2 to give more oomph to the songs that really need bass, and it has exceeded my expectation. It also has such a deep soundstage and pleasant mids. So now I'm listening to it more than my beloved Q701! But at least the Q701 is better with a number of genres^^.