Very interesting, Kiteki! I've only heard the ATH ES10 and A2000X out of the headphones that you write about. I tried the A2000X out at a few Bic Camera and Yodobashi Camera stores while living in Japan. I only used MP3 players as sources, but still liked the spacious and detailed sound.
I think that the ES10 is sort of like a bassy and trashy stepbrother of the A2000X. Together with a good source it sounds very good!
I've actually found a pair of earbuds that sound very much like the A2000X, the old Aiwa HP-D9:
I'm still looking for a pair of Aiwa HP-V99 after losing the auction last year. I recently lost a pair of Aiwa HP-V9 on Ebay. I stopped bidding at €610. The auction ended at €805!!!
Anyway, the D9 are probably not as rare as the older V9 and V99, so you should be able to find it cheaper. It's definitely the most detailed earbuds I've ever heard, close to full sized headphones such as ATH A2000X. Bass is extremely aenemic. You have to use an insane amount of bass boost to get it to sound balanced. But the mids and highs!!! Just amazing!
Today I'm rocking my ES10 together with my Sony HD5, by the way.
Edited by Danneq - 10/24/12 at 7:53am