Well, I confirm some things said previously and that is that it is not an "all-purpose" IEM for me and we enter the field of the specific IEM and despite having tried to match the FR using up to 13 bands, there remains the variable of the fit that makes the difference and the timbre inconsistency that many multidrivers have, in addition to the variable of the measurement after 10 kHz not being 100% reliable.
Having said this, with you I can use a bit of subjectivism because we have similar tastes, more or less: taking my "killer tracks" in my opinion it is not very suitable for male voices, tracks with a lot of "Loudness" or deep bass. It is not terrible but I do not hear them very natural and in general on the voices in my opinion there is a bit too much focus that works in some tracks with female voices, but loses in some male ones making some sibilants emerge that are a bit laborious and also lacking a bit of thickness in the voice itself.
It sits on a line that is sometimes crossed by tracks that have been produced with more compression than necessary, but in general it stays close to that line without straying too far like in the track "The court" by Peter Gabriel.
In general, otherwise I would make a long comment telling you track by track what I like and what I don't like, it sacrifices a bit of timbre especially of the voices in exchange for technical aspects that I think are very good, such as the soundstage and layering. It brings out many details that are in the background of the track (the details are always there if the track contains them, but some FRs are better at bringing out some things and others less because of auditory masking), the soundstage is quite wide, nicely separated and good imaging. I'll tell you, I'd be very curious to try one...
With some tracks, like those by Parov Stelar, I had a lot of fun and sometimes it almost sounds "spectacular".
Just based on the FR, would I want one as my only IEM? NO. However, if my impressions were to be reflected also with the real IEM and I had bought it with my eyes closed, I would be happy to have one to pair with the others but, having an E.Q. I would stick with Zero2 at that point, unless the experience with the IEM really turns out to be very different and positive; at which point I would buy it.

I'll give you a hint: take a good look at Meze Alba