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Leica Summilux-R 80mm f/1.4 showed quite heavy amount of flare., which can be observed in the shots below. With strong light source positioned next to the border of the frame, the lens shows noticeable amount  of ghosting and glare, pretty much throughout the aperture range. Both shots also show a noticeable drop off in contrast across the frame. Now, should this really be a major problem in real life? Doubtful, since you need to be pretty caareless to get such a heavy degree of flare. Even  if you do end up shooting in the direction of the sun, you can significantly cut off the amount of strey light hitting the front element of the lens by using the built-in lens hood.





Pretty much all superfast f/1.4 lenses vignette, so it really is not a question whether Summilux vignettes, but rather how much it vignettes. Turns out a fair bit, particularly on a full frame camera with a wide open aperture. At f/1.4, the lens shows vignetting ~1EV, which slowly drops to ~0.4EV by f/5/6. Smaller sensor cameras are much more forgiving when it comes down to light falloff - at f/1.4, Summilux shows only ~0.6EV, which further falls with stopped down apertures.



In real life you would see noticeable, particularly in lighter colored scenes, darkening of corners on full frame bodies. The artifact is easily correctable, either in-camera or during post-processing, so I would not stress too much about this. And on APS-C cameras you would not even notice any significant light falloff, so nothing to worry there either.

Vignetting @ f/1.4 - full frame vs 1.6x crop (80mm)
Vignetting @ f/1.4 - full frame vs 1.6x crop (80mm)



Leica Summilux-R 80mm f/1.4 E67 showed minimal distortion - at ~0.05% pincusion distortion is superficial and will not be visible in real life.