Just my 2c on X1 vs AKG k702:
1. Bass is real fun, and on other hand is quite good with o2 amp, I think I like that impact and subbass (from my mobile there is to much bass).
Thing is that akg bass is just short, quick like bumm (you can hear it but there is no impact) and gone empty space bumm and gone. AKG do not build "bass cushion". You will just get what is in mix and nothing more.
2. X1 music is closer to your ears, so I am missing that space, X1 is like room, k702 is like hall. So X1 is not as intimate.
3. X1 are good for quiet sessions where AKG shines if you play them louder then normal lvl.
4. High freq where more outlined and more detailed on AKG, they where just better.
5. X1 is like my stereo (tannoy v4) and AKG is like microscope designed for studio use. If mix is bad, you will not be able to listen to it.You can play game with pointing what is done wrong, how they balanced mix.
6. X1 is fun
and quite fast fun.
7. On AKG instrument are like 10m apart, so you can just track all sounds with no problem. With x1 music is a coherent whole.
8, My head is bit to big for X1 lol so comfort goes to AKG (and yes I do not have problem with bumps)
Now I am not sure if will keep X1, but for 180e (new) will I get any better? k712 is to expensive now :/