that is really strange man, and you might just be alone with that opinion
the E100 is definitely not v-shaped and has very forward mids to me as well. most mids heavy earphone I've heard actually. I have tried different foams and all sorts of wacky fits and still feel this way.
for this reason I can't say the Zen has less bass. the Zen sounds like it has a lot more bass, with particular emphasis in the sub bass.
as for detail, well as much as I like the E100 and its mids centric sound, it's taken a step down from my go-to earbud because the Zen sounds better in every way. Now if only the Zen had a tad bit more mids...
and now for some general feedback:
I wish I had some high end Blox or MX98x to make fair comparisons, but I don't so I can't really say much subjectively about the sound. All I can say is that the Zen is in a league above all of the much cheaper earbuds I have and does indeed have incredible bass. Best bass of any earbud or IEM I've owned recently. Maybe the ASG1 had bass this textured? but my memory isn't reliable there. Kick drums sound unreal on this thing.
Both the Asura and Zen have near non-existent sibilance, which I haven't seen mentioned yet. good for a relaxing sound.
The beta Asura has some serious sub bass emphasis that makes it sound really boomy. Like a treble peak but for bass. My Edifier H180 had a similar problem that prevented me from liking it, though it was more in the mid bass.
but I guess that doesn't really matter seeing as how the retail Asura will be closer to the Zen in sound signature. the beta Asura is still quite good though, and I'd place it around the level of my E100 and diyMX760 personally. Maybe a bit higher if it didn't have the bass boom.
The Zen's cable is just horribly microphonic. It has the most cable noise out of anything I own. I would at least like to see something like the Asura's cable on the Zen. The jack on my Zen also has some leftover plastic on the metal part, but that's just a minor annoyance.
and the freebie yuin lookalike earbud thrown in the early bird deal, which seems to be called the Nigu - uhh I think it's okay-ish, but has as extreme bass roll off as you might hear in a free airplane earbud. I couldn't listen to it very long. I'm sure the Monk will be much better though.