Well I'm not sure I even know what neutral is but I can certainly say that on music I know well, I do not notice any huge differences in frequency balance between the airmotivs and the BHSE/007 mkI. Nice quiet background when sitting between 3 - 4 ft from the speakers.
Edit: I'm not the person to compare anything o the HD800. Don't like them, especially for the price. If I was buying a Senn headphone, I would buy the 650s. I guess that's why I did.