Among those in the know, B&W doesn't follow the NRC principles of speaker design. That means they have "a sound", rather than a neutral sound profile. It's like having an integrated amp with an equalizer profile that can't be turned off.
Now is the perfect time to shop for loudspeakers because we now have publicly available measurements of hundreds of them at every price point. Try perusing the spinorama dot org website. The tonality/Olive score is a flawed but quick snapshot wrapped into a simple number; higher is generally better.
But it doesn't tell the whole story that the listening window and sound power curves tell; the NRC research says that if those lines are straight and predictable within a tight tolerance (say +/- 1.5 dB), they tend to win double blind listening tests over speakers with less controlled frequency responses. Eyeballing those two lines tell more than a raw score ever could.
Axiom publishes those curves on their website, and they're competitive with loudspeakers with tonal scores above 6.0.
https://www.axiomaudio.com/pub/media/catalog/product/m/8/m80_freq.gifThe Audio Unleashed podcast talked about a review of the B&W 805 D4, and had some colorful commentary on B&W's product design philosophy.
https://youtu.be/FSNMhB1UFiQ?list=PLPca_7i5G2sgIW7krPELAUQzeRPi9QxK_&t=2862 (time cued)