I'll be more specific since I own both, and I've heard the LCD-2, LCD-2.1, LCD-X and my preference is still the LCD-3F
The HD800 is a different animal entirely, with a mid-fi amp (ex. Meier and Schit -Rag) the LCD-3F is more impressive,
but with the GS-Xmk2 amp which I am currently using the HD800 gets scary good, the soundstage, comfort, and imaging>LCD-3F the Bass and Mids are close to =
Thx that is very helpful.. I've invested as much as I'm going to into amps with my Lyr + HG tubes so I'll just stick with my LCDs then.