If you listen at the office and want good sound insulation in both directions, along with truly natural bass (in terms of quality, meaning transparency and speed, along with fine depth), try Edition 8s if you can manage it.
I've also got the D7000s and agree with your impressions, and feel that the sound of the Ed. 8s is at a higher level in all of the areas you speak of.
(I never heard other Ultrasones other than my Ed8s.)
The bass of the Ed.8 makes the D7000 bass sound somewhat one-note in comparison. (This is relatively speaking, and I just feel the Ed8's bass has much more tonal shading
and a kind of friendly impact and great localization to the objects that produce them.)
The D7000s are very comfortable and light, true, but the Ed8s are comfortable in their own way, with a narrower ear-surround and bit higher clamping force, but nothing overdone,
and I got used to them quickly for multi-hour sessions, and they are very light. I would give the D7000s a nod to overall comfort not only of the the Ed. 8, but to most if not all phones out there.
Very nice, professional review you did there! I enjoyed it.