I was looking for loud, very good isolating headphones having wide frequences response to use at my work. I currently use DT770/80 + Matrix M-Stage + replaced OPAMs. It gives me a very good quality, but isolation and loudness is not as I expected. At home I have Sens HD380 + Recon 3d for gaming. For music I use Fiioe17 + AKG550. 
 
So I decided to buy ATH-PRO700MK2 to check out if I can use it with Matrix at work. You know.... loud metal music with no complains from my fellows at work...
My 1st impresssion was: is it broken ? After using of HD380s, I though these cans can simply squeeze my head. But with ath-700mk2's... boy, I was able to listen no more then 25 minutes of music, ufff... :
 
- earpads cover 80% of my ears - I have to use my hands to put my ear to be covered by earpad....
- the headphones simply squeezes my head... the spring is so tight
- I was not able to use it for longer then 20-30 minutes...
 
BUT... THE SOUND IS REALLY GOOD. Excellent dynamics, low/middles/highs perfectly suit to rock/metal music. Loudness is excellent.
 
Now I have schizophrenic recommendation: sound is perfect, comfort is much lower then having 2 weeks trip in 1st World War submarine... I will leave the headphones in the most spread position for 1-2 nigths... I will see. 
 
PS: I am quite a guy (185cm/96kg), having a feeling of squeezed and hurt head somehow contradics the picture of those very attractive girls wearing ath's700mk2 and having a ear-to-ear smile. 

Well, I  was looking for raplacement of my HD380 PRO at work.
 
The environment:
 
- music type: heavy metal (Slayer, Kat, Metallica, Paradise Lost, My Dying Bride, Candlemass, etc...)
- music source: laptop flac/high res m3
- DAC: Fiio e17
- AMP: depends: Fiio e17 or Fiio e17 docked into Fiio e9.
 
So, in comparison to HD380PRO, I find  DT 770/80:
 
- weaker in bass 
- better in mids
- better in highs
 
So probably I will not win Nobel prize quite obvious...
 
Overall hearing dynamics of HD380 is much better then DT770/80. however:
 
- HD380 just crashes my head with bases, while DT770/80 simply delivers it
- HD380 is much less comfortable after 1hr+ listening then DT770/80. Much. Really MUCH. 
- Mids were much better in  DT770/80 then in HD380
- Highs were much better in DT770/80 (I was able to hear separate clappings in concert recordings, while on HD380PRO I only heard noise)
- BUT!!! - HD 380Pro provides much more power of the sound. It is simply louder and much more dynamic... MUCH more then in DT77/80 case
- It is very hard to adjust EQ and AMP settings to different records in DT770/80 then in HD380 case. DT770 seems to be very very sensitive to EQ and APM settings, while HD380 takes anything and plays good.
- isolation of HD380 seems to be a TARGET which other closed headphone might only wish to reach (I use DT770/80 at work, and my collegues claim that they are louder much more than HD380PRO).
 
 
In general - DT770/80 gave me much more details what is happening in mids and highs. The sound is very clear in comparison to HD380PRO.
 
Am I satisfied ? NO. I expected much more power and more loudness&dynamics. So sooner or later I will find appropriate CLOSED headphones stuff.