I don't have the HD800's any longer. Having spent some time with them, I can't say that the JH13 have a larger soundstage or better depth. That would be asking a lot from, even the best IEM. Remember, I was using the Luxman P-1 with the HD800 and straight from iPhone with the JH13. I will say in terms of all else, highs, lows, etc. I'm believe the JH13 competes although doesn't sound the same. I can also say that I have no qualms about selling the HD800 and am very happy that I own the JH13. That's the best you are getting from me. I just have very little desire at this point of doing reviews or the like. I hope that helps a little.
See you tonight.