Audio Technica ath-m70x is the next step up from the high value ath-m50x - the ath-m70x is the top of the line Monitoring headphone from Audio Technica. The ath m70x has improved build quality with more metal in the headband and earcups, higher quality feeling earpads and a more flush, flat physical design for less bulk.
The ath-m70x has a much lower clamping pressure than similar monitor headphones, so m70x is more comfortable, especially for longer listening sessions. These are excellent for someone wearing full size headphones at work / during work, since they isolate well and are so comfortable. 97dB sensitivity means these are fairly easy to power and work great with a huge variety of dac's, pro interfaces or digital keyboards.
Compared to the popular m50x, the ath-m70x has a more linear, neutral sound profile, with improved clarity all around, especially in the midrange/vocals. M70x include 3 cables and a hard shell, flat carry case.
cnet.com, April 2016: Moving over to an Audio Technica ATH M50x, the sound was still sweet, but resolution losses were significant... Returning to the ATH M70x the music's energy felt liberated. True the ATH M70x has a brighter balance, but the treble was never harsh or grating.