imz14u2nv ,
I currently own a pair of E5c and Sensaphonics Prophonic 2X-S.
Before my purchase of my 2X-S, I went through reviews of UE10Pro and 2X-S here on Headfi, then I decided to go for it.
You can find reviews comparing between E5c, ER4, UE10Pro, and 2X-S (not all of them in the same post, but I believe you can come to a conclusion yourself after reading all of them)
I liked my E5c very much before, but now, I must say, 2X-S is just great! It is really incredible and the sound is really comfortable and relaxed, meaning you can listen to it for a long time without your ears feeling tired. Also, the details and the bass are still very well expressed when listening in a low volume!
Though it is designed for monitoring, but instead, I think it is a very musical headphone, very enjoyable indeed! I "desire" to listen to it whenever I can, no kidding!
And for UE10Pro or ES3, one of my friend has both of them. And I was really lucky, cuz her impressions magically fit with mine
so I had the chance to listen to both UE10Pro and ES3.
In my opinion, UE10Pro is as it is designed for, monitoring. The sound stage is really really big and wide, and the music, the vocal, the instruments, are close to you. I feel like really standing on a live performance stage in an open area. I think it is not as musical, but I believe it would be great if you use them to watch live tour DVDs LOL.
I also like the ES3. Just as others say, with the mid range bump you can feel that the vocal, the guitar are more expressed, but in a very comfortable way. The sound stage is also expressed in a very comfortable, but very different way from 2X-S. The ES3 is also a earphone you can listen to for a long time without feeling tired.
I have to say that I like 2X-S most, but, ES3 *might* be my next goal IF I have the money. Apart from IEMs, I am also willing to get a pair of HD650s, they are great too!