Thank you very much for your response! The way you describe it, I see no place for LCD-3 on the market unless they re-price them at 1300USD (and LCD-2 at 700USD).
Your impressions sound definitely promising... But in the end, these are going to be extremely expensive in Europe. I got my HD800 for 1200USD completely new but these LCD-X are going to cost over 2000USD here. So yeah, my interest in them is strictly "academical". Still, l am looking forward to read more impressions and especially see them measured :-)