Thank you so much!
Also just want to share:
Gunnar Dirks from Sennheiser has just confirmed to my associate that the measurements I posted were indeed taken on the Brüel and Kjaer Type 5128 HF HATS, and compensated to the 1/3rd octave Diffuse Field HRTF measured by B&K themselves.
Which means the measurements I posted earlier are likely the best measurements we'll have for a while until my colleague Resolve gets hands on it.
Posting a few comparison points again; all measured on the 5128, with the headphones other than HD 490 Pro being averages of multiple units (unless otherwise labeled)
And the most congruent comparisons, IMO:
The Sony and Beyerdynamic comparisons are the most interesting to me, as I'm wondering if all 3 brands are trying to chase the subjective sense of "externalization" a lot of listeners seem to want from their headphones. Sennheiser packaging their virtual surround/Atmos software thingy makes that more evident still.
Welp, excited to hear it and see how the build/comfort is, but again I think this will likely be one that doesn't work so well for me. But for those of us looking for a V-shaped open back with excellent bass extension, this seems a rather compelling offering/alternative to the MDR-MV1 and DT 900 Pro X.