Well I've never heard a bunch of CIEMs so I wouldn't know in that regards. But vs say the 1Plus2 and Flat 4 Sui the SE5 doesn't compare in dynamics IMO. This is in part due to the SE5s thicker sound which really won't allow for that due to this. The sound is overall more together, not sure is syrupy would be the word lol. That comes to mind though. In other words it just doesn't have that contrast that I desire.