I am interested in buying the Sennheiser Momentum In-Ear Headphones, and am worried they will not be much of a step up from my current Sony EX15LP's. I am by no means an audiophile, but I am noticing distortion in highs on fairly low volume. I was just wondering how much better the quality of sound and soundstage would be, and whether I would notice a decent enough increase in quality to merit the fairly large amount of money the Momentum's cost.