Just came home to my Cyan Blue ES4 waiting for me about an hour ago and am listening to them at the moment.
Using large Starline tips I've got a pretty good seal and isolation is pretty good.
The brown cable is also nice with no microphonics whatsoever
Sound wise I was expecting a nice upgrade from my ES3. But these are nothing like them at all.
The bass is a wee bit muddled and murky, Not muddy though just a bit over the place.
Mids are very nasal at the moment, like someone is singing with a cold. Very upfront and in your face.....nearly matching my ED12 actually but more nasal and very congested.
My biggest complaint at the moment though is the quite wonderful dancing treble on my ES3 has gone and I'm hearing a very un detailed and lost top end.
Actually the detail retrieval is actually much worse in general throughout the sound.
So at the moment I'm a tad disappointed but I'm gonna give them the evening and see if they get any better.
But at the moment they are certainly not the upgrade from the 3