Well, I got a short chance to hear some expensive headphones today, and they really didn't wow me given the price tag (LCD-2, GS1000i, and RS1i). I'll try to keep this short because I could type forever about this (I actually typed a lot on it, but I deleted it because I got tired of revising it...)
Source: some super expensive class A amp/dac (around $5k)
LCD-2:
Good soundstage depth, but very left/right feeling. It didn't sound very unified.
Airy sounding and very good separation
Not that comfortable. Leather is hard, and they sit firmly on your head. It has some good clamp on them, but nothing crazy.
The seal isn't that great because the headphones are very large.
No bass
GS1000i
Best soundstage out of the three. It sounded very 3d and complete.
Too bright
Comfort just sucks. The foam feels pretty rough. Very little clamp
Airy sounding and good separation
Impossible to get a good seal on these.
Forware midrange
No bass
RS1i
Very good soundstage that's similar to the GS1000i
Less treble than the GS1000is. Pretty similar to the LCD-2s
Midrange is a tad bit recessed compared to GS1000i, but both are forward.
Airy sounding and good separation
Comfort sucks on these too. Its basically just like the GS1000i, but the pads are sitting on your ears instead of around them.
No bass
I'm sure that if I had the chance to eq these headphones, they would have a much more prominent bass. Heck, even my headphones don't have any bass quantity when I don't eq them. Maybe if/when I go back there, I'll ask the people that work there if I can borrow the LCD-2s. Probably won't happen, but it's worth a shot. Something that one of the guys said there that really got me was that people were returning the Denon D7100s because they didn't sound that good.
Compared to my headphones, all of the ones mentioned above are brighter, have a larger soundstage in height, width, and depth, better separation, and are airier sounding. As far as detail goes, I really cant say. The source and the music was different from mine, but when I was listening to them, I was thinking that, detail wise, my headphones weren't that far behind. In fact, it was pretty darn close, especially for the massive price difference. If I had to choose between the three headphones, I would get the LCD-2s. Then, I would sell them
loljk
(maybe I would...).