The Shure SE535 is a dark sounding IEM with recessed mids?
I have been A/B the Shure SE535 against my neutral / flat Shure SRH 1840 and if I used a low-pass filter and removed some mid-frequencies a similar sound signature of the Shure SE535 was achieved.
(or my Shure SE535 must be broken, since I don't think my Shure SE535 IEM has emphasised mid range like a lot of people are saying on this board. It just has some missing frequencies which makes some part of the mid range stand out despite it not being emphasised )
Not sure how valid it is to compare an IEM to an open back set of premium cans. Even though, most would call the 535's premium UIEM's, the ability of the 1840's to provide wider sound stage, and more space between the instruments really can't be matched by any IEM, can it? The physics of the sound transmission just do not allow IEM's to produce the same experience.