The JHA Roxanne is something special I felt. Had already purchased my 846 when I tried it so I wasn't in the market + universal version is a bit of a difficult fit for me. But, the adjustable bass is very neat, you can get to the right amount for ones taste (or compensation for the DAP) and it didn't feel like a filter, more just like a loudness adjustment over the whole bass/low bass range.
For the mid/highs, from short listen, it seemed obvious the Roxanne was clearly extending higher in frequencies but keeping it all together with the rest, as typical of the house sound.
So, for me, I don't care much about the carbon thing, case, large size and price so am a happy camper with the 846. But, certainly, I wouldn't disregard the Roxanne from the short listen I had. I can't say the same of the 1+2, and other FitEars I tried, I must have the wrong ear canal shape for these!
Arnaud.