yeah, there's also very little agreement on what constitutes things like "mids" "treble" "bright" "dark" "forward" "veiled" etc. Even amongst experienced listeners, they can mean different things by these words at the margins.
E.G., to me, a headphone with an 8k spike is forward, while some will call it bright, some will call it shouty. Some will call 2k midrange, some will call it treble. Some will call 250 Hz bass, some will call it midrange. And even within what we all agree is midrange, many times people call this whole, rather large, region "mids" so some might say it has "recessed mids" when they really mean it is only recessed at 1kHz, while 500 Hz might be very present and powerful.
Further, when it comes to things like sibilance, even in an A/B scenario, sibilance has as much to do with your own personal inner ear resonances as it does the headphone itself. Like I have an inner ear resonance at 4kHz, so I can't stand headphones that are peaky at 4kHz (HD600), but others have an inner ear resonance at 8kHz, and may find Grados, the HE400i, or even the THX00 intolerable. If I'm not being precise I'd say the HD600 is brighter than the HE400i, but I see many others say the exact opposite.
Then, when it comes to soundstage, this is even more dependent on your own personal physiology and brain, even when ABing. You can take two people, with the same two headphones, and depending on their personal physiology and brains, one can hear A's soundstage as larger, one can hear B's soundstage as larger, given the same equipment, the same everything except ears and brain.