There are similarities, but the difference between the X1 and X2 are clearly noticeable. The X1 is quite a bit warmer, and the looseness in the bass is evident compared to the X2. The X2 isn't lacking in bass, but there is certainly more ominpresence in the X1. The X2 to me, is clearly the better headphone. I like my bass like anyone else, and I don't feel the X2 is lacking.
12/17/14 at 10:29pm