Of course. I have both the Japanese and Korean (by the band N.EX.T) Guilty Gear XX soundtracks.
My favorite of Ishiwatari is "Blue Water, Blue Sky" (May's theme.) But for Ky's theme, I vastly prefer the Korean version Pillars of the Underworld: https://www.youtube.com/watch?v=iY6D_BmNrs8
As for Orson's other tracks:
-That Insomnium song Ephemeral doesn't really do anything wrong, but it didn't move me like the Omnium Gatherum or Onmyo-Za songs. I felt like the vocals were a bit monotone and mixed too low so they lacked oomph.
- I didn't really like that Gentle Storm song. It did nothing wrong, but my benchmark band for folk infused death metal is Eluveitie and I'd rather listen to them than Gentle Storm.
-The Wilderun song was good and I liked the vocalist. His growls were deep and his cleans were melodic. Not my favorite of the stuff you recommended, but solid.
-Haken- Crystallized. That song was truly epic in every sense of the word. I heard more variety in those 20 minutes than I have in many 50+ hour games. I feel like after that song, I need a long nap, it's like a musical food coma.
My favorites of your recommendations are definitely Onmyo-Za, Omnium Gatherum, and new Pyramaze.