Included Vido measurements.
TLDR:
Sabia is best detail/timbre (fun signature)
Kube V1 is best soundstage (smooth warm signature)
Vido is best value (warm/dark signature)
eK2 is best for big ear holes (thick/dark signature)
This goes to show that what you hear seems to be in alignment with measurements.
To my ears, Vido is definitely less treble-happy than Sabia. Sabia is seemingly more coherent, less 'blurry'.
Kube V1 sits between the two for coherence, but has a unusually large soundstage with excellent positional cues that can't be ignored.
Vido and Sabia sound more in-your-head.
Sabia has the best bass texture and heft. A lot of full-size headphones can't do bass with this finesse and energy.
Vido certainly does seem to be the darkest sound, but not in a bad way. It represents insane value for money. I can hardly believe it.
I've tried a few different foam configurations on eK2 and definitely stacking does help.
I can't help hearing that it suffers from the biggest tonality issues. The dip between 2-5kHz is just impossible for me to ignore. Combined with forward 1-2Khz zone, vocals/mids sound too thick and flat.
Out of the four above, it's the one I would not recommend, however I still feel that my ears are not big enough for it, as the sound changes a lot with different positions when I move them around into places they don't settle.