How do Fujica G90BL's compare to the GSW690III'S?
I can't comment on the comparison because I've never used one of the later Fujica fixed lens 6x9s. However, I have three 6x9 and one 6x7 of the old type, and they really are great cameras. I have the 65mm f8, 100mm, 100mmAE, and 180mm lenses (my 50mm was stolen

) and all are incredibly sharp and nicely contrasty. Only the 100AE is multi-coated, and it is a little more contrasty than the others, but with the lens hoods used the single coated lenses are more than sufficient in that department.
I've just bought a mamiya 7ii with 80mm lens that gives me the option of cropping back to 6x6 but I really want to shoot 6x9 too. It'd be better to have an interchangeable lens compact 6x9 rangefinder to keep the bulk down.
I wouldn't call these cameras compact in any sense of the word, though it is true that one body and two lenses is more compact than two fixed lens cameras - probably...
Do you know the original Billingham Photo Hadley bag? I put a body with the 100AE attached, and the 65 and 180 lenses with their hoods and viewfinders into the main compartment of one, with film and a meter going in the outer pockets. If I want to I can just about squeeze a second body into one of the outer pockets too. That makes a very nice location bag and it is heavy but certainly not unmanageable - less weight than I often carry with a bag of 35mm and fast glass, for example.
Slides from these, and from the Fujica 645 RFs as well, are some of those most likely draw comment on how razor sharp they are when I take them to my drum scanning guy and he peers at them though his microscope. (Don't know why he looks at them through a microscope, but he often does

)
Peter