So for now I finished with Beyerdynamic DT990 PRO (money saver). This I a short comparison:
Soundstage:
AKG k240 mkII - spherical 360°, spatial, just magic very pleasant experience, I love it!
Beyerdynamic DT990 PRO - music scene in front, reminds a set of speakers, fairly wide, nothing special in comparison to AKG
AKG win
Bass:
k240 mkII - no subass, tile, simply integrated into music, drums do not have enough energy
DT990 PRO - nice (sub)bass I can not say that it's too much (so it makes me basshead?), well controlled
Beyerdynamic win
Mid:
k240 mkII - all I can say, AKG mid
990 - I want AKG mid
AKG win
Treble:
AKG - shallow, I like bit more exposed, never annoying
Beyerdynamic - as exposed as bass, could be less exposed, sometime annoying
In my taste draw with an indication of DT990 PRO (my taste)
Comfort:
Beyerdynamic is a vice trying to crush my head, to much pressure, after 1-2 hours uncomfortable
AKG have fantastic comfort! win
Build quality:
Draw with an indication of AKG k240 mkII, Beyerdynamic headphone pads do not look to durable, probably fall apart quickly.
General:
DT990 PRO are musical and AKG analytical. I would like to combine bass and treble of DT990PRO with comfort, mid and soundstage of AKG