Thanks for replying - I just edited my post with context: I am looking for natural tonality that ATR/ZS3 kinda had, and was worried when ZS10 was criticised at https://www.headfonia.com/review-kz-zs10/
I will check out ES4 - does it have incoherence like the similar ZST hardware? Actually I have heard both the B400 and Comet, which new KZ do you think strikes a similar balance in terms of relatively natural tonality, resolving just enough detail and sounding fun (there's a ZSA too?!)?
Thanks for the help! Shoutout to the DP-S1 too haha.
Wow, the B400 and Comet are such totally different animals it is hard to consider them in the same sentence. Other than price point and the fact they fit in your ear, they have almost nothing in common. I think based on what you bring up though on natural tonality, I'd give the Es4 a go. I'll make the offer that if you'll cover shipping, I have a Zs6, 10, R, and ES4 that I could send you to audition.