Thanks obobskivich.
After reading tons of threads/reviews here and there, If I want to conclude briefly:
Airiness
T880>ESP950>HE400>HD600
Deatiledness
T880>ESP950>HD600>HE400
Neutrality
T880>ESP950/HD600>HE400
Accuracy
T880/HD600/ESP950>HE400
Soundstage Depth:ESP950>HD600>DT880>HE400
Soundstage Width
T880>ESP950>HD600>HE400
Sub-bass:HE400>DT880>ESP950 & HD600
Bass Impact:HE400>HD600>DT880>ESP950
Bass Quality:ESP950>DT880>HE400>HD600
Mids Quality:ESP950>HD600>DT880>HE400
Treble Imapct
T880>ESP950>HE400>HD600
Treble Quality:ESP950>DT880>HE400>HD600
Warm to Cold:HD600>HE400>ESP950>DT880
Coloration:HE400>HD600>ESP950>DT880
Fatigue
T880>ESP950>HE400>HD600
Instrument Separation:HE400>DT880 & HD600
Imaging:?
Center area:?
Build Quality
T880>HD600>HE400>ESP950
Comfort:ESP 950>DT880>HD600>HE400
Is there anything wrong in my personal conclusion?