I have both the GS645S and the GS645. The light meters in both cameras are right on. The 60mm lens on the GS645S always amazes me; it as sharp as can be. The lens 75mm lens on the GS645 folder is also amazingly sharp. The folder is easer to carry. I also have a Bronica RF645; I had the 45mm, 65mm and 100mm lenses for it (I have sold the 45mm and 100mm lens and have the body the 65mm lens and dedicated flash for sale on this site). No question that the interchange able lenses are great and the built in light meter, light the Fuji's is right on. But, to me, the Bronica does not produces as sharp a negative as the Fuji's.