OP
all of the above are great post. I have not heard a Coda, but I am a pass labs kind of guy
However, I notice that your previous gear is a tube 300B. I own an Audio note clone 845 based SET and before I purchased this unit, it was a shoot off between 300B JeLabs design versus 845. I chose the 845 simply because for the dynamics and PRAT, while the JELabs 300B presented a lot of lovely 300B liquidity.
going on, I then compared my XA25 to the 845 clone and I can tell you this, they are nearly close to each other. the xa 25 advantage is its ability to represent music in a 3D like space more than the 845 clone.
but other than that, the PRAT, tone and vocals of females are very surreal. very palpable.
So, i hope i was able to convey how a xa25 may sound like.as comparing to your 300b tube, xa25 can push more power. I suggest if you can demo both, that will be the best way.
Good luck