I do
https://imgur.com/iGzEwCe
I'm still trying to make it past the honeymoon phase, but right now I enjoy the 5200 a lot more. Comfort goes to the Fostex and I already scuffed my 5200 cups since they the finish is the most fragile I've ever seen, its so matte that its actually textured so anything that smooths out that texture will leave a scuff. I scuffed it by stretching on my aeron which has a slightly textured plastic rim on the top seat, but luckily its along the edge so difficult to see. Denon has better clamp, fostex is worn pretty loose even on my large head, fostex has limited aftermarket cables at higher prices. Fostex headband for sure is the inferior of the two with a lot of tension being put on a single pin held by an fine threaded thin screw, which was the point of failure for the original owner of my 610, over 50 bucks if you want to replace it via OEM parts btw.
Both have more than acceptable timbre, I really enjoy both but denon has better mid bass and bass impact to me, both have good mids in general but I think fostex has a slightly more fatiguing treble for me. As far as price, I got my fostex 610 for $101 shipped with a broken yoke which I just ziptied, and my Denon 5200 new in box for $300. Both you can get far below MSRP on ebay and other trade forums like this, so I really wouldn't let that influence your opinion on each.
I think both have pads that will eventually disintigrate and both have headbands that seem like they would do the same. Also haven't gone down your playlist yet hopefully I'll get to that tonight, if not then tomorrow.