The lenses are excellent so I don't see why you couldn't use it in a studio. However, none of the lenses focus close enough for head shots, and the overall lack of lenses available in different focal lengths is limiting. Essentially, there are two lenses available, the 65 and 45mms. If you're lucky, you can find the 100/135.
For a walk-around medium format, the Bronica RF can't be beat. But if you're going to do studio work and you want a used system, I'd look at the Mamiya RB67 series. The prices are low and there are excellent lenses available.