From someone who doesn't care about backing up his purchase with flare :)
In all honesty, I've heard HD650s (which I think are near perfect), Shure SE530 (way too dark and need high frequency boost), and a bunch of other stuff that I rank below these, so there's no point in mentioning them.
Now I have a pair of JH16s in my ears. Okay, they are amazing, no doubt about it. BUT.
They have OBSCENE amounts of bass. Like not normal at all. JH did state that they are +10db at 50Hz, and boy do you hear those +10db. The bass is clean and punchy, and it does not affect the higher mids (200-1KHz range) and high frequencies. They are all there, crisp and bright as they should be, something I couldn't achieve with the SE530 without equalizing (such a dark earphone). But it does in my opinion slightly affect how you perceive the lower mids (say 100-200Hz range).
Anyways, it's like going from a 2.0 reference monitor setup to a 2.1 setup, heck more like a 2.2 setup with two subs right beside you. I listen to mostly trance, tech house, and ambient/lounge music so these are great, but I can see them definitely not working for other genres. Also, I would strongly recommend them if you are a low volume listener. Usually the bass is the first thing that you tend to miss at low volume, with these it keeps thumping. At higher volumes...boy oh boy, my retinas start vibrating.
So make no mistake, these are bass monsters. If you like that, these will put a huge smile on your face. If you want a more reference sound (kind of what I was looking for), choose something else. Go for the JH13 or the Westone ES5. They should offer a more linear and truthful representation of the frequency spectrum.
Also as a final note, props to JH for prepping them in one week's time and getting me a perfect fit and seal.
I hope this was informative for all of those considering them!