The immediacy in impact and presentation will vary with the amp you use, while hte instrument separation will vary with the source material and source (it can go vice versa if one of them's not up to the task, like a good DAC with a weak and distorting amp will still lose detail). That said, the RS2 most likely will require you have associated gear upgraded too to make the most out of that price difference, which ultimately means thetotal cash outlay is higher.
And also consider your source material. If most of what you listen to is mostly 1 drum set with one guitar and one bass and one vocalist, which is a bare minimum for modern/current music, chancs are the layering of the music doesn't have much more that can be revealed by more expensive set-ups. On the other hand, Metallica with just one more guitar really does sound better when you get better cans and amplification. Even the decoding part. When I was in high school I didn't get why the sheets were too complex, when the thing is, I just wasn't listening to it right.