That's a pompous stance. If I had blindly followed detractors like you I would've formed the impression that the HD800 is the death of music. Kinda like how the regurgitated myths of a veiled and lifeless headphone made me weary of the HD650. I'm glad I took a punt against the zealots. Buying, spending time and subsequently building a system around both headphones made me realise that they're not mutually exclusive.
To me the HD650 and HD800 are both as musically engaging. The HD650 with its warm, homogenous yet pleasing tint. The HD800 with its unfiltered rendition of the recording. To my ears, the HD800 is the reference, the more neutral headphone.
I have no qualms with grating treble. IMO, that's symptomatic of inadequate gear upstream. You don't need coloured components to blunt the HD800's peaks, just gear sans the sandy grit evident in the upper registers. Some will claim this quality is only found in expensive gear. The Vali lays waste to that in the amp department. Not sure about an equivalent source in the same price bracket, unfortunately.
I wonder - have you even heard the HD800?