Have played them side by side on a few occasions, one of them being when I was deciding between buying the Clear, HD800S, LCD-2 or HEX v2.
It's true that the HD800S has a bigger soundstage (both in width and depth) than the others. It also has great imaging to go along with it. But the bass left me a little unsatisfied, overall slightly too lean sound for me, and the treble was just a little too harsh/fatiguing for me. Would love to own one for certain moods and genres, but I didn't want it as my daily driver. The Clear handles that role perfectly imo.
Totally agree. Had the HD800S for about 2 years and found them lean in general. Got the Clear last week and although not perfect, their fuller body sound made it for me. Would love the Clear to have the soundstage/imaging of the HD800S but clearly Clear are more engaging and fun.