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Hrm interesting, depending on what you mean by glow, I think wide open glow can really add some character to shot. Can you share an example of the glow ? I wonder if it glows the my CZJ glows, that would be pretty neat!
So far as I know, the only difference between the SSC and the FD L is the number of aperture blades (9 in the SSC and 8 in the L), so it likely has nicer stopped down bokeh. Everything LightShow is saying about the SSC holds true for the L, anyway, though some of the problem may be the camera or adapter and not the lens itself. Shot on a native mount on film, while it won't wow you with resolution of fine details, they are more apparent then on shots taken with the a7 wide open. But that's also true of the EF L- if you want the best out of that lens, shoot it on its native mount.
I do love my FD L, partially because of the "glow", which leads to some gentle focus transitions.
a7_FD85L_Frankie by thisgunforhire70, on Flickr
Snow_a7_FD85L_1 by thisgunforhire70, on Flickr