Yes, it has an absurdly high resistance. I forget if it was over 100ohms or 1000ohm, lol. But again, this is for chat gaming, and I feel the resistance may be due to the mic channel being in the mix and maybe needing a higher resistance.
In any case, you guys need to remember that cable resistance is subtle when it comes to sound changes. BoomPro included. It doesn't make a headphone sound like crap. It's just not as good as a standard cable. When you're voice chatting, it's not like you're listening to the game loudly to begin with.
As for KL712 and X2, the mids on the X2 are more integrated than the 712. The 712 has a bit of distance in the mids, so it's ot as flat as the X2 sounds. Otherwise, the K712 is a technically better headphone, with a larger soundstage.
Personally though, I like the tonality of the X2 more than the 712, and I feel it's not far behind in technicalities.
It'd take a lot for me to give up the X2 at this point. The 712 wouldn't be one I'd do it for.