I am REALLY skeptical about this. Even 4000$ Utopia can't beat the HD800 in some aspects, it is rather matter of choice when comparing these two. And Focal is really well know name on the speaker side. + it uses beryllium that is toxic and very hard to manufacture in it's design
Also given the fact that Z1R is closed back desing and the fact that Z7 sucked.... If i would be you, i would not sell the HD800S. If your main priority is sound-quality.
Of course you have shown that you are bit of an Sony fanboy, so your placebo might kick in when listening those
And the dac/amp selection in HD800/S is key to making them sound superb
Then don't eat the beryllium drivers.
The HD800S does cast a more expansive sound stage...but then again, no other headphone can beat the HD800/HD800S in this regard. But to my ears, the Utopias are better at everything else sonically. They get out of the way of the music like no other headphone I've heard...simply amazing presentation. That said, the HD800S are still amazing headphones and still impress me each time I listen to them. I've said this before, but my HD800S ain't going anywhere anytime soon.