Jim, still a good choice I think. Not much to add to comments already in this thread including my own. The camera is surprisingly light and compact, so it's very easy to have with you. The 60mm lens has a 60° angle of view on the Fuji. Your Summaron 35 should have an angle of 63°, but it's hard to compare directly when the film formats have different proportions. The Fuji is comparable to using a 28mm on an M8 or a 75mm on 6x7... just about ideal in my opinion for a one-lens solution.
I've had my GS645S since 2002 and don't use it as often as other rigs like the Bronica RF645, partly because of the shutter-tripping clack and partly because its user interface is more typical of folders and other traditional leaf-shutter cameras and less like the Leica/Voigtlander/Zeiss Ikon (and the Bronica) that is more familiar to me.
Still, it has not only parallax-compensation but also field-size correction, and is so light and compact i just have to choose it at times. FWIW, the viewfinder is 0.5x magnification and shows 91% of the lens coverage, focuses to 1m and takes common 49mm filters. The viewfinder is bright & clear, shows areas outside the framelines, but the focusing spot is fuzzy around the edges, not a sharply-defined spot like Leica.