Now that my Empyreans have broken in I have some listening impressions after about a month with the Ether 2. Cross-posting this on both threads.
Empyrean:
+ soundstage significantly larger than Ether 2
+ holographic sound with alcantara pads
+ by far the most comfortable headphone I've owned
+ easier to drive than Ether 2
- lacking bass extension compared to Ether 2
- mid bass hump with leather pads that can be fatiguing
- not as smooth to listen to at louder volumes due to U signature and treble emphasis
Ether2:
+ noticeably more accurate and linear bass that extends lower than the Empyreans
+ fleshy mids that bring out a nice texture on vocals and brass instruments
+ more neutral sounding across range with a smooth treble
+ natural sounding even at louder volumes
- tight fit is noticeable and I have a normal sized head
- less open and airy sounding than Empyrean
Summary: I am really impressed with the Ether2's bass and mids, they have a really natural sound signature that just lacks air and space compared to Empyreans or Abyss, but more open sounding than the Utopia. The Empyreans throw out a really nice large image with the velour pads, which are noticeably more neutral than the leather ones. The imaging is almost holographic like the Abyss. They just don't do bass as well as the Ether 2 or Abyss, for my preferences. I really like that I can plug Empyrean into my macbook pro or phone and get a very decent results. They're so comfortable that I forget I have them on after a while, they just disappear on my head.
I am torn, I don't know which one to keep yet. I'm going to listen to the Empyrean for a week then switch back to Ether 2 and see if my impressions change.