Brief opinion on ESX after more than a week of listening and comparisons.
Very nice IEM, a beautiful top plate - "cracked lines", two metals and great gold/bronze grills:
Compared to CRA and CRA+, ESX feel more weighty (less agile/fragile), less V-shaped. Thr bass is potent, and with wide-bore tips is not overwhelming to my ears.
ESX are well-resolving, though again less agile than CRA, CRA+ and HZ Mirror, the champion of resolution (at least at the first impression).
Aria still feels to me as more mature tuning all the way. While I am more appreciative of V than Harman, the near-boring tuning of Aria with those subtle spikes at 5 and 10 kHz works well for me - not so as my listening preference, but as a very good reference.
Overexaggerated 5 Hz region of CRA made me feel the treble/sibilance (not my preference for long listeming).
Compared to CRA, CRA+ offers more conservative, safer tuning. Does it worth alnost twice more? Not so much to me, but both were worthy competitors to listen to.
Overall, ESX, CRA and CRA× were all very enjoyable experience. The best deal for the money is still arguably CRA. More solid, weighty overall champion is ESX. CRA+ is close.