What is the all-time greatest asian IEM so far?
Is it the FLC 8s?
In terms of price-performance-ratio? Probably. But the NocturnaL Audio Atlantis is a really strong contender as well (although in a higher price and also performance league). Both the FLC8s as well as the Atlantis offer a technical performance that is quite a bit higher than one would probably expect for the price.
But in the end technical performance is only one aspect that should be considered, and personal preferences in terms of tonal tuning do play a more important role than technical qualities alone (for example, although the Fostex TH-X00 is technically on a higher level than the Sennheiser HD 600 (or let's say Shure SRH440 when comparing closed-back headphones with each other), I would personally always pick the HD 600 (or SRH440) over the TH-X00 for balanced/serious listening compared to the TH-X00 that would be my choice for an engaging "fun" listening session).