Short story long -
I have the Audio Hekili for comparison, notes on my review below
"...sound like a concert hall with main emphasis on the bass although mids and highs are still clear and non-sibilant...warm, v-shape sound signature ... Soundstage, tonality, and imaging are great. They're also not difficult to drive."
Ehhiku is a bit bigger(might not reflect clearly on the pics but you will feel the difference when you're A/B testing both)
stems are retained so no changes there, a minor gripe I discovered is that AZLA Sednas will lose grip over time and may come off more easily as you use them, probably due to my sweaty head. I've lost a pair after some months of daily use because the stem doesn't have an edge that the tips can grab on to so you need to use the tightest wrapping tips that you can possibly fit(Moondrop's tips are a good example, and maybe comply foams)
at the same volume setting, the playback is louder on the ehhiku so they're slightly easier to drive
more forward on the mids and highs, they essentially traded atmosphere/soundstage for clarity, and made the overall presentation more intense and in your face. I'd describe it as the Hekili has all of the players be spread apart and all of them are playing at a relatively similar volume, but you can hear the bass without trying to look for it whereas the Ehhiku sets the bassist and the kickdrums a bit towards the back, while the pianos, guitars and vocalist are front and center. You can still hear the bass but you'd have to focus. Setting the volume to where the bass matches the Hekili on this set will cause pain in the mids/highs. The clarity on the other hand is where this set shines. Micro instruments and chimes and flourishes are just there, no need to focus just to find them. They are similar timbre-wise so no discernable change over the quality of the vocals/strings other than the loudness.
they're less expensive than the previous iterations(this costs 100USD less, 199 vs 299) that I feel is due to the config of the drivers and maybe the cable as well(?) the tips and case are relatively similar(different color on the case and stock cable)no cable qc issues this time so that is a relief
Long story short - Conclusion
Absolute value for the money. They are great at the technicals-instrument separation is great, as well as no discernable distortion at high volumes. Soundstage is decent, and has a fairly neutral-bright sound signature which is weird considering the setup implies a bass-heavy config(3DD-4BA vs 1DD-7BA on the Hekili) so you may want to use a warmer source than a neutral one if you prefer a more relaxed sound which is also the case for me.