I'm not from Munich, but I have a Pentax 6x7. Mine has the penta prism with meter I also have the waist level finder. Both finders are very easy to focus with. The 105mm is f2.4 so it really snaps into focus. I also have a 55mm which is a slower lens and a wide angle so just like an SLR it is a little harder to focus, but it does have depth of field going for it. My 200mm is an f 4. So it is a little darker but focuses nicely.
The quality of the images is hard to beat. The only downside is the size and weight. It does keep me from taking to some location. All of my lenses handle color very well, and I'm not afraid to shoot it handheld (not the 200mm). This is the 55mm handheld:
Ektar 100 Pentax 6x7
by John Carter
, on Flickr