**I haven't heard the X1 to be honest... K712 has more of a clean midbass hump than the K612, but the K612 has deeper sub-bass extension. Honestly closer than their price difference belies, the main benefit of the K712 is the detachable cables, deeper Earpads of memory foam (nice but not crucial), more premium headband leather (no comfort difference IMO), and a little detail refinement. For first nice headphone I'd just get the K612, you can upgrade it with an amp and new pads later if you want. If you need closed headphones... Well, I don't end up needing them, so I defer to others' opinions. Any headphone will end up uncomfortable during the flight between USA & China, lol.
Thanks for your advice! I did check out your video on YT and I'm amazed how little sound leakage open headphones actually give. I'm eyeing the K612 now as well, though I think I'd need a better DAC/Amp than my U3 (so I will either get the Omni for all purpose PC usage, or the E17 so I can use that with my iPhone as well). As for headphones, at this point I'm just looking for a good deal, so I'll probably snag any of the following if I can find a good deal : K612, HP100, HP200, or x1 :)
Thanks again, Stillhart! I feel like I cannot go wrong with any of these headphones. I'm a bit upset that I didn't see this thread earlier this year when I could have potentially bought the x1 new for $150 on Amazon, haha. Either way, I am just looking for a good deal on one of these, and if no deals surface, I will probably get the k612 and an E17/Omni since it seems to give me the most "bang for my buck." :)