So now I spent a few hours, some initial impressions for the comfort. I don't like the headband design. It is thick and soft from the top but but short and too curved, and the two ends of the headband have plastic parts and they do touch my head. I do have a larger head and, for example, I cannot get a proper fit with Diana, but still there could have been a better design. The headband should have been longer and the end should have not been terminated with a plastic part. That is a fail.
D8000 also does not have the most comfortable headband design but what they have done is, the driver parts can rotate which helps to find a better location on the head tilting the headband back and forward.
One thing that is good is the clamping force. D8000 has a strong clamping force and with those huge "pillows" it gets waaaaarm. And they are round. Solitaire has a better earcup design (which also gives a taller sound), though it is not rotatable like the D8000.
My other beloved HP, D9200 also presses on my head from the top and it has much less cushion, but it is lighter than both, so the weight makes up for it.
In that sense, I think HFM has the best comfort and design, although it might not be the most robust. Focal also has a better comfort. I wish I loved the sound more (I liked the Clear, though listened shortly).
EDIT: I have fit problems with many, so it is still at a level I can overlook (by tilting "the whole HP" to the front), but wish it was better.