Hi,
I use the Fuji GX680III, and yes it is no Sinar P3, but it is an excellent camera, even with its "limited" movements, not that that has ever stopped me from getting a shot. Mainly studio product and jewelry. The range of lenses is hardly limited at 18, from 50mm to 500mm, and the ability to use 4x5 lenses with an adapter.
The point is you need to decide what you need, and then see what fits your needs best, for me it was the Fuji, for others it will be different.
Good luck.
Jason Berge