TMR Audio is a vendor that re-sells used audio equipment (a.k.a. The Music Room). They are excellent in customer service. I have purchased from them several times.
If you have some good ear buds, maybe you can listen to some youtube videos. Obviously, it's not going to sound as if you were really there hearing the speaker, but I have actually found it is very good at giving you an idea of the "sonic character" of a speaker.
Some videos of the Wilson Sophia 3.
https://www.youtube.com/watch?v=6TVLTrCz6eA
https://www.youtube.com/watch?v=bAtMYfRQzQs
https://www.youtube.com/watch?v=bHbKSvs9Myw
With the B&W D3 series, you should be able to hear that the midrange is a lot stronger and more solid, but not quite as "crystal clear" sounding. I think the B&W has pretty good strength in bass/midbass. In my own opinion, I think the B&W D3 sounds the most natural and real. It depends on your personal tastes which you like better.
https://www.youtube.com/watch?v=zCTJKbYfF7E
https://www.youtube.com/watch?v=4w8Mobopd58
https://www.youtube.com/watch?v=mQgm_eq_cJ8
Here's an example of a more "warm" sounding midrange. The previous generation B&W Diamond (D2) has a warmer / less clear sounding midrange.
https://www.youtube.com/watch?v=DHpSAD9hpPI
With Focal, hopefully you will be able to hear the difference in character. Once again, it's all personal taste.
https://www.youtube.com/watch?v=tJD2j4aMpqo
https://www.youtube.com/watch?v=D5kedweNG34
https://www.youtube.com/watch?v=Dmu3srt2VmU
Hopefully all this helps.