Just took delivery of my C16's so I'm holding back on definitive impression on it. But took some photos as I know there are some who would like to compare how they fit and size relative to other IEMs.
Was doing a not so serious A/B with the AS10 and ZS7.
First impressions, compared to the AS10 is that it was like Utopia versus a HE1000 V2. Astounding amount of detail in both earphones but the C16 comes across with really 'thicker' and more filled out of sorts. My first impression when I tried the Utopia compared to the HE1K2 some months back. Everything gets thrown at you in an obvious manner. AS10 comparatively is more laid back and somewhat less 'luscious' in its sound though nothing is really missing if you listen to it on its own.
Probably need a whole lot more time to give a better description. So far : C16 is absolutely great sounding for classical music but somehow there seems to be detectable differences in signature when using different amps to play them. There seems to be a hint of sibilance on low power amps but it doesn't seem to manifest when I use my desktop amp. Not sure its the amp or the nature of the earphone though. Maybe those who do have it can chime in there.
The ZS7 is a different animal altogether due to the heavier bass emphasis.
Some picts: