I own the Pentax 645Nii and the Yashica Mat 124G (poor man's Rollei.) I enjoy working with both cameras but of all my cameras the Pentax gets far and away the most use. Most of the Pentax lenses are truly magnificent and the price is definitely good. I don't own one, but I have had the fortune to use a couple different Hasselblads, and they are very, very nice cameras. The difference is the format, and the cost. If the money is no object I am sure you will enjoy the Hasselblad, but I have never been remotely tempted to give up my Pentax.