I think part of what made the UERM so impressive was its flat bass output, which has an amazing clarifying effect on the overall presentation. So maybe I wasn't hearing any more details than are presented by the ES5 or JH16, but rather the details were not as veiled by what (to my ears) appears to be a light sub-bass bump in the case of the JH16 and a light mid-bass bump in the case of the ES5.
And those subtle bass bumps have certain advantages, like extra ambient noise blocking when in a noisy environment. Not to mention that the ES5 and JH16 just have different sound signatures that may suit certain kinds of music better; in the case of the ES5, I think it's vocal-centric studio stuff, while for the JH16, it's probably live and instrumental stuff where soundstage and ambience are key parts of the recording.