Not an X20, but I just gave this a try on my X7 (neck meets the body at the cutaway around the 17th fret)... I could comfortably play a C above the octave. Moving up two frets was more of a stretch (uncomfortably doable, though).
I would sure think you would have more neck real estate on the X20.
One of the songs I frequently play is Beginnings (Chicago), which starts with an Amaj7 above the octave. Other than that, I don't play many chords above the octave, but do find my fingers up there on an occasional lead run.
Probably not as specific as you'd like. I'm gonna have to try an X20 one of these days.
Good luck with the decisions,
Jim
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