Any improvement from"Grado"325i to "Grado"RS2?

Just bought some Grado 325i's,and was wondering would the RS2,sound better? Running a headroom micro portable amp.Thanks: Ron.
The RS-2 is more detailed than the SR325i. It does not have the low end of the SR325i but if you change to the Flat Pads, which brings the drivers closer to your ears, the bass improves. The RS-2's are a lot lighter than the SR325i. The SR325i can become fatiguing because of the weight. Not a musical comment but thought it was important. The RS-2's are almost as good as the RS-1 in my opinion. I know all of the Grado's very well, feel free to ask me any questions.