Wilsons are the best speakers in the world

It should be obvious that they use them because they believe Wilson speakers will result in their equipment sounding its best. Since “many” manufacturers use them, clearly many people share this belief.

If you like different speakers better, that’s great. Enjoy them.

There is no such thing as "a" best speaker. Wilson has become seen that way by some in the same way The Rolling Stones came to be considered "The best Rock 'n' Roll Band in the world" by some. That wasn't true either.

Nah, Queen is better with Iranian ancestry singer.
Problem is that they are unlikely to believe that about Wilsons. I got an idea. Why don't I ask Vladimir of Lamm and Dimitris of Ypsilon? Well, I can ask, question is can they answer? I doubt it, seriously doubt it. Vladimir is fond of Kharma speakers, don't ask me how I know it, but I do. Dimitris really likes Lansche. I share their taste. They do demo with Kharma and Lansche respectively but not always. There is so much of the usual BS in High-End.

Wilson, in the right system, gets as close to "Real" as I've heard.

Wilson make excellent speakers with extremely high quality build and finishes. They are widely available. A sort of Rolex of audio. They sound excellent and although they may not be of great value they are solid well built and keep their resale value. 

They sound much better than B&W to me and the pulp and paper and fabric dome drivers they used are better (to my ears) than ceramic accuton ones used on Kharmas (Kharma are great speakers too). 

Hard rigid drivers (polypropylene, metal, ceramic) will "ring" and this affects timbre and muddies details. I can hear it.