Okay guys,
@mikemercer and I have been putting the AK100 Mk2, AK120, AK100II, AK120II and AK240 through some intensive listening for the past two days in a quiet environment. We quickly realized that T.H.E. Show was not ideal for this, so we asked Astell&Kern for loaners and they were kind enough to oblige.
In case you guys ever try something crazy like this, let me give you two tips:
1. Comparative critical listening is best done with fresh ears. You'll get better results by taking frequent breaks.
2. Do NOT underestimate how long it can take to volume match five different units with all of the test tracks you are using.
That said, we have some pretty clear impressions now. We'll be posting our findings tomorrow. But before we do, I just wanted to throw out one quick thing: AK240 owners need not be butthurt. The AK240's SQ is (IMO) better than all of the others... both noticeably and consistently.
Thanks for being patient guys!