So it looks like the link I posted above for the 9H was from Audio Doctor's NY Show room. I just did a web search for "Persona 9H and room size" and that photo came up.
Every time I climb the stairs of my home I see the big narrow empty space currently functioning as my toddlers play area. I have tried to figure out what speakers would fit in there, specifically seeing if the KEF Blades would work along the short wall. Unfortunately, some comments I read here, including by Audio Doctor, indicate that the sound would be compromised along the short wall. Sad times for this potential Blade buyer. The long wall setup is a no go (family wise).
However, today I learned after an email discussion with both the management of Vivid Audio and the profession sound technician that acoustically treated my upstairs office room, that the Vivid Kaya 45 will work in my room. The Vivid guys did not say for sure that it work but the sound tech and I
deciphered the comments on the speakers dispersion pattern to figure out that it would work.
To me, the Kaya 90 (which I heard) actually sounds a bit like the KEF Blade. I did like the Kaya 90 a bit more than the KEF Blade-ish KEF Reference 5 which was surprising. I am targeting the smaller Kaya 45 which has less bass.
https://www.soundstageultra.com/index.php/equipment-menu/865-vivid-audio-kaya-45-loudspeakers
Why mention this? Well I like the Persona 3F and the Kaya 45 EQUALLY.
However, I did not want to get a Persona 9H for my downstairs space if I got a Persona 3F for the small room upstairs. So in the past, I have not seriously considered the 9H.
Now I have a great sounding option for both rooms. Audio Doctor you will get a call from me on the Persona 9H. No dealer around me area that demos this one and likely knows it as well as you. Need some patience though.