You might do a search for photo samples in the Gallery... Use the Advanced Search and under Camera Model choose "645NII" which is the closest to the 645N. Looks like all but one of the photos are mine. Oh well... 🙂
This is a nice camera system, very well behaved, compact, reliable. There are pluses and minuses. There are different film holders for 120 and 220 film. I feel they could have designed the film holders to convert from one to the other by flipping a lever on the holder. As it is, the 220 holders can be converted easily to 120, fortunate given the decline in 220 film availability. So, no need to pay a big premium in price for the 120 holders.
The camera feels long and narrow to me, as if it were a video camera. I prefer the shape and ergonomics of the larger P67 series, a system I feel is very easy to like. And shifting the pressure plate changes the setup for 120 or 220 film. 🙂
The P645 system has some nice varifocal lenses ... 33-55mm, 45-85mm, 55-110mm, 80-160mm and IIRC a 150-300. These are sharp and maintain a constant f/stop as the focal length changes. I would choose these as most convenient for landscape work. Also, the P67 lenses work quite well, with the adapter providing auto aperture, but of course no AF.