There’s a very brief comment on this in my review of the Elegia:
Of the headphones in my collection, the Clear and the Elex are the closest sounding to the Elegia - in fact they’re very close both tonally and in terms of timbre. If you were after a closed-back Elex, then you don’t need to look any further on that front. The Elear are a significant departure from all three, and without a pad-swap (to the Elex or Clear pads) do not really make the grade here.
… and …
From a purely technical perspective, the Elegia have resolution and clarity, as well as micro-dynamic performance that falls somewhere between the Elex/Elear and the Clear and otherwise perform on about the same level as the Elex.
And then the frequency response plot for both of them (see measurement details here), aligned at 1 kHz and using my custom calibration:
