Olympus OM 28mm f3.5
The Olympus OM 28mm f3.5 is an inexpensive lens, perhaps because it is soft at f3.5 and the aperture only clicks at full stops. At f5.6, the next setting, it is far from soft and it sharpens nicely. This wide open softening is typical of 28mm lenses in my experience.
My test lens has significant scratching in the front coating of the front element. It's a fine example of someone using their zipper to wipe their lens. Despite that the lens is still very sharp and shows no unusual flare or softening. I'm sure it would fall apart if pointed directly into the sun but I am surprised at how well the lens coating has absorbed and countered the scratching.
ISO 400 - f8 - 50% crop