^^
Nope, gunner has got a point. You cant evaluate any sound-device until you have spent some time with it. Your ears had gotten used to your earlier stock IEMs, so the new ones, unless they are significantly "better" than your stock ones would pretty much sound the same in initial hearings. I know this because I have had this happen to myself. I had a run off the mill 350 rupee panasonics that sounded great for the price, but when I first got my Grados, I was kind of shocked. I didnt know how I expected them t sound, but I believed that they'd blow away the Panas. Well they didnt. They sounded good, but the Panas sounded nearly the same. Now after a few months I can appreciate the difference better. While I still adore my Panas for being extreme VFM options, there is simply no way they can rival the SR60i or even the SM E10. When it comes to the nuances of music - the texture of the drums, the emotion in the voice, the light breathy tones, the highs - the Pana is left in the dust. And btw, the Pana when I bought it was a major step up from any stock earphone, and still is my choice under 1k (Haven't heard the SM's in that price range though).
No matter how sharp your ears are, or how confident you are in your abilities, there is a good chance you are not comparing the earphones in the way they are meant to be. They both produce the same sounds and thats why they sound similar, but once you know where to look you'll start finding the differences. And you will begin to realise why the High end IEMs are, well, high-end. Dont use the music supplied at the showrooms to make your decisions. ALWAYS carry your own music. Preferably in a good device and not some el-cheapo pseudo-branded mp'5' players boasting of putting everyone else to shame. Take a song/few songs that you have some kind of connection with and have listened extensively when doing nothing else. Use it to gauge the earphones. And also, NEVER ever try to "think" of the tune when you compare sounds, human mind is very capable of filling in details that dont really exist. Hope that makes some sense to you