Well, i've just entered the audiophile world half a year ago so, sorry if these are not very good descriptions. Through my ears the treble on the HE-500 is more sparkly with more energy, and if there are acoustic instruments such as a guitar, the instruments are more 'alive' than the LCD-2 , although the soundstage and imaging on the LCD is a tad better. The mids on the HE-500 is a bit thicker, but i prefer LCD's as its more sweeter. On the bass section there's no beating LCD as its a monster, but the bass on HE-500 is pretty good too except for its sub bass.
hmmm and nope, you explaned it quite well. and when i have trouble describing sound, i see it as a sort of puzzle. describing sound is like solving a crime, you have all this evidence which leads to ideas and thoughts based on past experiences and events. you have different leads and clues you find, and you have many different people telling the the story, you just have to put it together
well thanks for the comparison!