I've had the se-monitor 5 for 1 week. I have compared them to my Focal elegia, focal clear, AKG K872, UE 18+pro (CIEM's), and my ultrasone signature pro.
Without getting into a full review, I'm selling the elegia and AKG K872 (the open back clear still have a place in my life). The se-monitor 5 is accurate and these are not bass shy as some note. The elegia is bass shy in comparison. The Ak872 have more bass heft but less control. And the elegia are way to forward in the mids in comparison to the se-monitor 5. Because of the "in your face" mids of the elegia they sound closed in in comparison to the se-monitor 5. Listening to eric clapton unplugged live I feel like i'm in the audience w him on stage. With the elegia it feels like he's literally standing in front of my face singing. The elegia were my favorite recent closed back but the se-monitor 5 now take the cake and they are much less clamping force so they are more comfortable. The icing is the 3 cables (elegia cable is horrible), and the interchangeable pads (leather are better and elegia use suede like which will get cruddy over time).
I got these for $480 on amazon (on sale for $699 and I had a $220 credit). The elegia cost me $750 (open box) plus i bought a new cable to replace **** stock cable. The se-monitor 5 at retail of $999 is worth it (i paid 999 for ultrasone which are not in the same league)
Source was all Hires and flac files from my chord mojo/hiby r3 stack (a match made in heaven)!