Okay, moment of truth.. After almost a day of burn-in process, the Shure SE215 Special Edition started to change its sound. It's better than the out-of-the-box, but very small. I cannot say confidently that it is the same good as the demo I heard b4, but I like the change. But, compared to the Sennheiser MX 985, SE215 SE is bad. The dynamic driver of them seemed like have heaven-and-earth quality. I do not say "heaven-and-hell" because SE215 SE has some quality that not every IEMs has. It is sounded fun, w/ enough bass quantity while the texture is still guarded and the mids is clear. However, the trebel is recessed, not sparkling as I like. This may cause the "airy" sound disappear. I can accept this since it belong to low-end class from Shure. Meanwhile, Sennheiser MX 985 is belong to the highest class for earbuds. Its mid sounds so pure, like hearing a diva singing. The bass is full-bodied, like none is missing into the air (while it is a leaky earbuds!). The trebel is sparkling like a diamond in the sky. It has airy sound that make any musics sound smooth. I feel so much fun w/ MX 985! The only sad moment is when I have to go on travel or work, since I cannot enjoy its sound at all in noisy environment.
Time to sum up. Sennheiser MX 985 and Shure SE215 Special Edition have some common ground: they are dynamic-driven, share the same price class, and will give you some fun. From there everything will go separate ways. Sennheiser MX 985 has amazing sound and add so much fun to it. It is quite comfortable to wear, even while in bed w/ it against the head and pillow. It has metal and porcelain parts that gives a luxury and extremely durable sense. Its amazing things start to disappear once noise enter the environment. That is when Shure SE215 SE rise. Being an IEM, it will block the noise and give comfortable when use while sleeping. w/ the free-from-noise sound, the real quality of sound produced become obvious. It is not equal to its price (even my VSonic GR07 mkII has so much clear sound w/ lower price). It is still fun, but not as much as MX 985. And, it all made from plastic!