It is.. but i'm a little afraid about comfort (weight,headband,pressure on the head)
This is one of the main reason HD-800 is interesting to me at the moment or i would jump on the HE-6, LCD3, Stax sr-007 mk1/2, Sr-009..
i currently have the ESP-950 that weight 260g, really comfy and once you start having a comfortable headphone it's kinda hard to go back.
I don't wan't any sibilance created by the phone that is not in the recording tho so maybe the HD800 will not be for me.
ESP-950 is perfect on this..
I might try to find an better amp for the ESP-950 too but i douth it will fix the "in the head" soundstage.. maybe the Master 7 will widen the soundstage with those tho
I don't have any complaints about the HE-6 comfort wise. You can bend the headband however you like it so pressure isn't a big deal either. It is a heavy headphone but when the headband is adjusted to your liking, the weight is distributed very well anyway. I wear mine for hours without fatigue.
HE-6 definitely does not have sibilance when properly amped. Any reviews or complaints about sibilance was because those amps were greatly underpowering these monster.
For a neutral sounding setup, the HE-6 should be greatly considered.