Well I have been using the SR2's kind of regularly. Before and after my newest headphone, the Focal Radiance, I have been comparing these to my beloved Focal Elex's.
It has been surprisingly close! The Elex have a more narrow sound stage, comparable bass and more high end leading to more detail, IME.
The SR2's have a wide stage, very good bass, and pretty good mids.
I would say the Elex's are more technical and the SR2's are more fun. The wider, broader presentation really sweeps you up in the music. The Elex's win on clean and clear. My favourite music sounded different on both and for the most part, I enjoyed both.
I had a test list of 13 songs that I played with each headphone on my iFi Pro iCAN, using just a minimal bit of bass boost.
Then I did it again with the Violectric V220. They sound much closer on the V220. The soft, warm sound rounded both them off.
The iFi gave each one a noticeably different sound signature.
I can see why the SR2's have a solid fan bass. I am really curious to try them out on my new-to-me Rebel amp tomorrow.