These three lenses are among the best Leica has to offer. The EM is a bit behind the other two. Given its performance level, we need the highest possible expertise to approach the limits of the other two. The SAA and the AME are in my opinion equal, but show a subtly different fingerprint. The SAA excels at image clarity of extremely fine details where the AME excels at the crisp rendering of the same details.
Fine detail is recorded with good contrast but soft edges.
This recording capacility holds on axis and only slightly drops in the field. Extremely fine details are just visible, but it depends on the film if you can see them. Stopping down improves the contrast and the recording of extremely fine detail. The edges of outlines stay a bit soft. Higher contrast give the extremely fine detail more clarity and sharper edges.