In all honesty: I think TechmanZ is spot on for most of the KZ IEMs. He has one weak spot - for me - and that is he totally loves the ZST’s. I think they are the most fatiguing KZ’s out there, with too little bass and way too piercing highs. He on the other hand, prefers it over the KZ top models and ZSR, for example.
See, that’s ok. To each his own. But when I think he says they’re like the ZST’s, I think he says he likes the ES4 too.
I hope he doesn’t try to say they’re the same. Because they’re absolutely not. The ES4 has delicately tuned down highs and a far more pronounced bass. They aren’t the same at all.
That’s why I like the ES4 so much.