My start in mf went from yashica d, to mamiya c3300, to rollei. The mamiya was a good , if somewhat big and bulky workhorse, but after shooting a rollei I was never again happy with it. If I recall correctly, I had a black 80mm, a black 180, and a silver 65. They were ok lenses, but the glass in even my 3.5 tessar rollei was clearly better.May very well have been my particular samples.
I would say that unless you are hell bent on having the interchangeable lenses, go for the rollei and don't look back.