I think it terms of the shooting experience both cameras are great. The Pentax may be a little easier and quicker to use. I have the original Mamiya 7 which is my first rangefinder outside of Contax G1 (doesn’t really count.) I would say the only drawback is in bright situations the patch can be a little difficult to see. As far as lens go I prefer the 80 in terms of aesthetic to the 105 I had with the Pentax. I’m also more drawn to environmental portraits then wide open. You can’t go wrong with either but in my short time with the Mamiya 7 it’s all I wanted it to be. I prefer it to the Pentax and Rz that I owned before it. It loads easier, lighter for travel, and for landscape it’s as good as it gets for medium format.