Hey all, I got a chance to listen to all three flagship customs recently
I managed to get both pairs of another members (I wonder who) UE11 Pro and JH13 Pro crammed into my ears and of course I have my ES3X.
Caveats: Unfortunately since I did not have IEMs custom made for my ears in two cases I admit there may be a very large flaw in my methodology so take these impressions for what they are meant to be - my experience and opinion. That said - I do feel like I got great seals on each IEM and my experience with IEMs is extensive enough to convince me I heard what I needed to hear to evaluate my interest in these IEMs.
The UE11 Pro was my least favorite of the three. I heard a significant bass bump, they seemed colored and placed the listener further from the stage than the other two IEMs. I could see them being extremely enjoyable for some music genres like classic rock but not so for others.
The JH13 Pro were a tiny bit disappointing only because my expectations were very high after I had read such great reviews. I found the bass to be excellent, amazing really, the highs to be nice but not great and I was surprised to hear the mids sounded more than a bit dull/recessed. The soundstage was very large and more forward than the UE11 Pro. Another surprise was that I had to turn the volume of the player up to roughly 60% for comfortable listening (at a similar level to the other IEMs) during the session and could have gone to roughly 75% w/o it being too loud. The UE11 Pro and ES3X approached the same level of volume at roughly 30% of the players volume capacity. Overall, the JH13 Pro sounded very nice, maybe approaching great but the explosive bolts on my socks failed to detonate.
Comparatively, among the three, the ES3X seem much more accurate in reproduction and more balanced across the frequency range to me than the other two IEMs. While I have seen the ES3X described here as forward, they are more forward then the JH13 or certainly the UE11 Pro. I would describe them as having an onstage presence - they give me the impression I am onstage during the performance. Overall I find the ES3X to be equally enjoyable for classical, jazz, acoustic and rock. I also would say that the bottom line is that if I could keep only one of my current headphones, I'd choose the ES3X. I could not say that for the other two IEMs.
For a comparative reference, my favorite two headphones (I own) are a recabled (SAA) balanced and modified Grado HP1000/HP1 and a highly modified pair of Grado HF-1 with PS-1 drivers and Moon Audio silver dragon cable. During the listening sessions with the IEMs I listened to selections from Diana Krall "Very Best of", Donald Fagen "Morph the Cat", Eva Cassidy "Live at Blues Alley" and Five for Fighting - "Live Session" in high bitrate or AIFF un-amped from my iPhone 3G.