I owned a Fuji GL690 and it was a heavy beast so I know what you mean, but honestly I dont think my 4x5 super graphic is that much heavier.
I had the fuji 65mm F5.6 lens and a 100mm lens and they were both decent, but honestly I have other MF and LF lenses that I think are just as sharp.
I should have asked my question differrently. Can a leica with the best lens and something like copex or gigabit film equal a fuji 645 with the same film.
I guess what I am saying is, Are Leica lenses sharp enough to make the format shift nil.