If you hire a technician, they will tell you the problems the piano has, and tell you the qualities of the piano that will be practically immutable (e.g., aspects of timbre and resonance). The technician won't be able to tell you if the sound is what you prefer though.
More likely than not, for the average Steinway in a store, the technician will suggest getting it voiced and regulated, which will carry a $1000+ price tag and a couple days' worth of work. Maybe that doesn't matter if you're already spending $200k, though.