+1 for the Etymotic ER-4. They sound fantastic. Two things to watch out for, based on my experience only:

- They go a looong way into the ear canal. This makes them great for environmental noise rejection but can be problem if you are prone to wax build up or sensitive to foreign objects.
- The cables are very microphonic, so use the clip to keep them in place.

Other than that, I've not found anything else which comes close in terms of detail.

Main: Roon-Mac, Oracle Delphi/SME 309/Cadenza Blue, GSP Reflex C, 218, DSP5200SEU, Sky Q, Samsung 49KS7000
Office: Roon-Mac, Quad Vena 2, DALI Opticon 1
Prototype and learning: 101, M30 mk1
Next project: Vintage LS3/5A, QUAD 303