I earned a BS using mostly my Mamiya 645. I have two lenses, 55, 80, 150 and Kenko 2x extender. I even used it at Brooks along with 35 and 4x5. I have a special feeling about the 120 format though, I guess it was the larger size over 35 when I first started. Now its a great freedom from my 11x14.
Curt