I worked with a pentax 67, pentax645 and a hasselblad.
The 67 was to big, and the depth of field to narrow for shooting out of the hand when the light was less.
The 645 was a nice camera, but since i planned to stick to analog, i wanted to buy a manual camera without electronics because these fail eventually and nobody can repair it in x years time.
Eventually i came to hassy, and must say the zeiss lenses are superior towards pentax (sorry). everything is manually and easily to repair. nice optional tools and afordable these days...