So this round focuses (first round, second round) on two very different things: whether the image is pleasing, and corner sharpness. Clinical sharpness is not always desirable in portraits. Since I don't have a subject to sit still in the same pose, I decided to use my daughter's bitty baby doll, which is reasonably life-like.
Test Setup
4.5 ft away, no crop, ISO 640. Light is provided by a window behind the camera to avoid the risk of flare.
The Results
The Summicron, whose "flare?" harms the technical quality of the image in previous tests, it actually improves the portrait. Some Leica enthusiasts have called this "Leica glow". They may be right. Based on the test setup with the image being front light, I don't see how stray lights enter the lens.
Nokton 50/1.5 at f2
Heliar 50/2 at f2
Summicron 50/2 DR at f2
Summitar 50/2 at f2
Corner Sharpness
This is the same image as above and cropped to the writing on the side. I'm not sure if the letters are within the depth of field of the image, but you can notice that the Summitar is clearly much worse than the others.
Nokton
Heliar 50/2 at f2
Summicron 50/2 at f2
Summitar f/2
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