Another point I'd like to make is that with the atmosphere here and the reliability problems, your Chi-Fi bargains are likely to accumulate quickly and might be more expensive than used or cheapest options Western makers provide. I mean, most people come here to get good sound on the cheap, not develop a passion and a collection, nevertheless the unwilled latter is what seems to happen often. And, again, if the measurements
here are correct, then I'm inclined to think that very few to none cheap Chi-Fi makers employ engineers that understand audiology and how to actually make drivers. Meaning that they get drivers that sound somewhat okay from who knows where and put them in various casings, play with vents, tuning foam, maybe with how much power the drivers get. While acclaimed makers know every piece and detail of even the oldest or cheapest thing they make.
I still plan to get ZST and maybe even ZS5 (and extra cables if they're cheap), but cheapest Western IEMs vs Chi-Fi is still a fair fight. And the former might still be winning, I think - contrary to the general consensus here.