FD vs. EF lenses - the difference in optical quality?

[2Stroke]

It is between EF and FD lenses some kind of appreciable difference, unless the absence of AF and all the other electronic gadgets in FD lenses, if we consider optical quality of lens only - optical aberations, transmission of contrast, vignetting, bokeh, etc etc? It is true that the Canon EF 50mm f/1.4 will do almost the same pictures as the Canon FD 50mm f/1.4 (mounted with adapter which has no glass element in it) on the same camera?

I found many images from both FD and EF lenses, but no credible direct comparison. In all comparisons I found they were used cheap EF-FD adaptor with glass element of poor quality.

I know that using the FD lenses on EOS cameras is nonsense, I'm interested in comparsion of FD and EF lenses only in terms of optical quality, not the applicability on the modern DSLRs.