I've voted "other".
I have the Earsonics SM2 and they are already a leap ahead in the mids compared to the Shure SE420. I'm pretty sure they'll easily beat the SE530.
Even better : they recently released the SM3 which are supposed to be at the very least as detailed as the UM3x with the IE8 soundstage and the musicality of the SM2. These could be the current mids champions, given that Earsonics' line up is always very good in the mids and that the EM3-pro are accordingly better than the JH13 in the mids. The Earsonics mids are by far the most liquid I've ever heard. They're not as forward as the Shures, but still quite proeminent. Overall super smooth. Some people wrote that their mids are like liquid gold poured into your ears.
Overall the Earsonics sound is described as follow :
- Super liquid
- Super refined and elegant
- Very smooth
- On the warm side of neutral
- Not too forward, not too distant - average, but with a very engaging sound signature.
- Smooth bass, even though the SM3 one has been described as tighter than the IE8 one.
- airy, extended and non-fatiguing trebles.
Problem : the SM3 are very expensive outside of the euro zone.
And it does not mean that overall my SM2 are better than top tier headphones (though I'm pretty sure the SM3 are a class above). But regarding mids, I've almost never heard of anybody even criticizing Earsonics' mids in general.
The SM2 have a few flaws that make them not so great for fast and dirty tracks (Nirana for example), but Earsonics accordingly addressed all these issues with the SM3 while improving almost everything at once.