II am a month into a new pair of B&W 804D3’s and couldn’t be happier. Upgraded from 805S and the difference is astonishing. To be fair, I also upgraded amp and sources, so the whole rig is substantially better than what I had before. I have not heard the others in your list of candidates, but the people at my dealer sell Magico and told me that the A3 is a great speaker but felt the 804 is more natural in its presentation. The guys who delivered and installed everything told me that the 804 is their favorite in the B&W 800 series. The install and listen to lots of very expensive and well reviewed stuff so I give their opinion a lot of credence.
However, just like wine, everyone tastes something different out of the bottle, so go “tasting” to find your match.