So I auditioned the Westone UM3X and the Etymotic ER4P. The UM3X has the samw veil I heard in the Westone 4 and lacks the separation and clarity I'm looking for. The ER4P had decent separation and clarity but was a little too bright and too much emphasis on the highs. However, auditioning the ER4P was more of an afterthought today because prior to that, I was listening to something far better; the AKG K3003.
My god. My fucking god. The K3003 are truly in a class of their own in the IEM space. I own the IE8 and have heard the W4, SE535 and UM3X. Not one of them even comes anywhere close to the clarity and separation and tonal balance the K3003 offers. They are highly analytical and fairly neutral. The bass is detailed and ever present but only comes to the forefront when needed. The highs are tight and controlled and never sibilant. The mids are just so ever slightly forward but are never dominant. These IEMs are the only ones I have found that comes anywhere close to replicating the Beyerdynamic T1. Simply incredible.
At more than a thousand dollars, they are not cheap. However, I don't wish to go down the customs route so these are my only option for now. My only concern is that the cable is non-detachable and I fear that should the cables be subject to the occasional bout of stress (a distinct possibility since I will be using them while traveling and commuting), I might end up with a $1000 deadweight.