OTOH, being a mirrorless system you can use an adapter for pretty much any lens ever made, not only Canon but any possible glass that has been used in the modern history of photography. And some times without any significant loss of functionality.

But yeah, its true. Professionals take to stick to brands for a lot of reasons. Investment already made in lenses, repairability, how easy is to find a colleague during a job that can loan you some missing equipment, etc...

Sony is not going to conquer the professional market overnight, granted, but it's important to have this camera in their catalog to start moving things in that direction.