In my search of the perfect travel IEM ..... (beside TWS which are still not at these sound quality level by a significant margin)
From left (up down to right up down) :
HA-FW1800 I really enjoy the sound quality, though a bit bulky, but sounds like a charm with Spinfit 1025
IER-Z1R the absolute reference with stock tips .. for sound quality (with NW-WM1A-NP) but probably the most uncomfortable

and weak MMCX connector
XBA-N3AP (with spinfit W1), actually my preferred IEM (with some PEQ for mid high and highs), though I can't sleep with them an whole night, but at 130€ new, surely the best bargain I made, and for me in the same league as my IER-Z1R (after EQ)
WU Zetian ... my first step with planars ...definitely a real success maybe a real keeper.
IE800, the smallest size with a very nice sound quality (need some EQ too to be at best sound level), but not possible to be used with balanced amp. Far too much driver flex noise when I sleep with them.
IE600 (with Comply Foam T-500) the spicy modern sound quality with nice low frequencies and the most comfortable for sleeping, I still prefer the IE900 (which is not on the picture due to being serviced actually by Sennheiser by a faulty mmcx connector). I keep both, but IE900, for me, is nearer IER-Z1R sound quality just behind N3AP.
x Crinacle Zero, the cheapest, clearly over exposed on forums last year, though it's a pure Harman Target frequency response (my reference)..I almost never use => it's as cheap and tasty as a bigmac menu.
Xelento V1, for sure the most comfortable IEM for an whole night, with a very decent sound quality (though after some EQ mid-high/high).. But a bit too much driver flex noise when I sleep with them (IE600 is more usable for such purpose).
VE EXT, with a sound quality not really far from IER Z1R, but very weak MMCX connectors too.. so .. in nearly 2 years, I am a bit too frustrated more than happy for servicing it too often.
In short, for IEMs, my ranking is based on what I really own (not just eared, as it takes weeks for me to really appreciate any IEM with appropriate tips and PEQ):
1)
My reference (sound quality) is clearly the IER-Z1R (but mine is out of order due to some MMCX issue on one driver)
2)
My keepers in order of preference XBA-N3AP, IE900, HA-FW1800, Wu Zetian, Xelento
3)
Not bad.. but not my preferred IEMs too => EXT, IE600, IE800.
4) Not sure they are worth really the money ................. x Crinacle zero.
My sources are first as largely preferred the WM1A-NP .. then in preferred order Kann Alpha, BTR7, Centrance M8V2, iFiGoBlu, UP4(22), Fiio M11/M9, HiBy 6Pro..
After my IER-Z1R, IE900 and EXT experiences=> for sure, the XBA-N3AP 130€, HA-FW1800 250€ and Wu Zetian 140€ convinced me, I have no need any-more to pay thousands of Euros for an IEM, as with much cheaper IEM, we can get more than very decent sound quality (with proper tips and, of course, some PoweramEQ PEQ adjustments under android 10+ based on AutoEQ to Harman Curve or another)..
My feeling is that this IEM industry has really changed these 2 last years in price tag 2000 to 5000€ or more, with being far from same level of SQ quality improvement... Most are maybe good artisans, but I am not even sure they can produce continuously same sound quality with their sold IEMs.. I feel too much like a gamble to buy these more or less homemade thousands € IEMs.
NB) I consider, that I became, these last 2 years, clearly a typical (Harman Response Curve) head ... probably like 70% of listeners, though depending on music genre and maybe the time or wether, I can do some more PEQ adjustments to the Harman Freq Response Curve that many wouldn't do.

.... just for my pure own selfish pleasure.