I am not exactly sure about who would be qualified to be respected musicians. Many musicians I personally know are respected in their local community, but none of them are world renowned nor millionaires. I guess less then 10% (or far less than than) of professional musicians (either respected or not) can afford hi-fi systems that cost over several tens of thousand USD, even though some of them own their own instruments that worth over tens of thousand dollars.
I am not a musician, and as far as I know, none of those musicians I know have audio equipment even close to what I have. They will have their jaws dropped when they listen to my systems.
Having said that, it will be interesting to know what kinds of systems are preferred/used by professional musicians who are audiophiles. I am personally interested in knowing preferred systems by orchestral conductors of classical music because they will care about the reproduction of the trueness of voices of each instruments, the full spectrum and balance of sound and imaging, even though many times the recording quality has more to do with such characteristics.
One of the reasons why I bought Gershman Grande Avant Garde speakers was that I read about that the makers effort to hear live music once a week and go on Sundays to listen to an orchestra music to make their speakers sound as accurate as possible, and have their own studios for musicians perform live and let their audience listen their speakers and hear about their opinion.