I have the following KZ's ~
ED9 - detailed, 2 sets of nozzles for optional sound signatures, well built, some love them...some don't. I do.
HDS1 - small & comfy, cable stinks, neutral balanced sound, can sound flat but overall very nice iem for small $.
ATE - dark with rolled off treble, nicely textured sound sig, designed for wire up, I like them and kept them.
EDSE - dynamic sound from top to bottom, sound great from portable players (Clip & Fuse), great build quality.
ED3c Acme - smooth, dynamic, detailed, impressive, one of my favorites, I think they are excellent for the $
EDR2 - good highs & lows, well built, feel lighter than EDSE, good all arounder but I prefer ED3c JMHO.
ZS1 - couldn't get the right fit\tip so never really got to hear them, wire up, keeping them in hope I can find a tip that works...
I have owned but either sold or gave away ~
S3 - wanted to love them but didn't, little ragged in the highs at times...could have been a tip issue.
ED10 - loved them at first but each listen brought issue's, bassy, too bright, harsh highs, some people love these though so YMMV
ATE-S - again wire up fit issue's, bassy, didn't have the time to try and get them where they needed to be...sold
ED3 Perfection - built like a tank, pretty nice sounding but overshadowed by more current KZ options.
system = Beresford amp & DAC, spinning real CD's...old skool