Originally posted by vrrattko For me it is difficult to say which is better, maybe I favour FA43 a bit more, but IMHO they are quite different lenses. I see FA43 as one that is ultrasharp in centre and gives sort of impressionistic bokeh, while FA31 is more even across the frame and very smooth rendering. I once bought FA31 because somebody reasoned with me that it can always replace FA43 with just a little crop - that is not true. Both lenses render images differently.
I love all three amigos, but I use the FA31 the most, simply because it is a "normal" focal length. However, if I were to choose a favorite for sharpness and rendering characteristics, it would be the FA43. On an APS-C camera, it makes an excellent portrait lens. Other users may have different preferences, which is understandable, because we are splitting hairs here.
Rob