LCD-3F has considerably more resolution and finesse than LCD-2F. This was evident for friends of mine who are not audiophiles and compared both side by side too.
Which is why I stated above that my new-found love for the LCD-2F is strictly based on taste - and I'll say it again:
I don't believe the LCD-2F is superior to the LCD-3F in any way - I'm just really enjoyin' the hell outta my LCD-2F!!
and, the more I use it, now that it's broken in...
The LCD-3F is closing in FAST!!