X2s easily outperform HD6*0s for fun, EDM music enjoyent. The Senns win on neutral naturalness, and lifelikeness. But for music that has beats and bass, X2s are the better choice.
And if you want to increase that fun and joy go for X00s. They are not perfect, but definitely better than X2s. If you like EDM, you like the space and bass of X2s, you have a decent amp/DAC, your next step is X00s. Without a question. Tighter, deeper bass. More fun. The DAC/amp you own however starts to play a more important role.
You need to improve the components of your system simultaneously. Otherwise you start to loose capacity that you could enjoy for your money.
Source, DAC/amp, hps should come from the same category to bring out the most of each other. In my opinion this is something many head-fi users slip by. And many of them start to draw immature conclusions, regarding this attitude.
There is no ultimate perfect sound. But the final perfection can always be improved.
I think, it is rather the enthusiasm and will of change than hearing the actually perfect sound signature.
New approaches of 'perfect sound' are actually more exciting than the present 'perfect sound.'.