It is oft forgotten that detail is in the eye of the person beholding it.
To me detail is where the phones are good enough to allow separation of instrments without letting go of the actual signature of the music.
The ety's are a fantastic phone.
the MSP is like a more musical version of the 4P. It has got more bass, sounds just right, It doesn't try to push any particular instru. forward. It is like sitting to a personal performance just for you by the artist. This phone is not about soundstage cos it does not try to depict a soundstage. It is like you are in the middle of it and it is all around you.
As far as detailing goes, the RS-1's tend to miss a few notes due to there brghter presentation of the music itself. the MSP as i mentioned before is laidback compared to the RS-1. That is why some details become more apparent.
Compared to the RS-1 , I wouold take the MSP anyday, I like the music to flow with me, not force me to go with it.
the 4S is a class act, let's reember before anyone else did it, the ety's were there.
Some might contend that westone was there but i reckon in canalphones just for sheer detail and value4money i would get the 4S.
If I had too much money, then I would buy all the phones just for the heck of it and listen to my favorite songs over and over again in all the different flavors that are present on the headphone market.
Cheers
Kunwar