Just picked up a pair of these to replace Audeze EL-8C for my work set up. Interestingly, at first, I found the Denons to be less comfortable than the EL8 (though the EL8 do not provide quite as much isolation). Quickly though I found I adjusted to the feeling of the Denons. On first listen, mostly to Spotify via Schiit Mimby and Asgard 2, I thought they sounded pretty good, but wasn't wowed. But then I took a listen to some FLAC files I had on my computer, and wow, what a difference - they really sang. I felt like the EL8 were versatile in that for a long time in my office I only had my iPhone and they were more than enough, but then I wanted to expand my desktop setup. The EL8 sounded better with the DAC and amp, but within a few hours of listening to the Denons through the same setup, the Denons are definitely a step up, and really sound amazing with good source files. Do these headphones need break-in time or are they going to sound more or less the same after a number of hours?