I may go against the grain, however I'd stand by the opinion that the FA 50/1.4 is indispensible. I very rarely shoot at f/1.4, but I have often shot at f/2.0 with absolutely stellar results. Perhaps not in terms of microcontrast, but the bokeh and control of DoF is excellent with the FA 50.
I find the 31 and 77 ltds are exquisite straight out of the camera, but with some PP work my FA 50 results can come quite close to what these FA ltds can produce. Having the FA ltds makes me wonder whether I should keep the FA 50, and indeed I use it a lot less now, but I've just been too pleased with it to let it go.
Might just leave it to the Mrs to use once she gets into photography.