The Pentax 40mm Limited has an average review score of 91%

Score (%):
Pentax SMC-DA 40mm f/2.8 Limited - Review
The Pentax SMC DA 40mm f/2.8 exhibits a quite harmonious optical performance combined with excellent build quality. It is capable to produce very sharp images across the frame straight from the max. aperture. Distortions are marginal and CAs are a non-issue.
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83

Pentax 40mm f/2.8 Limited SMC P-DA
A lens that is fun to use. It is lightweight, I can really feel the difference from other lenses I have when carrying the camera around. It can fit in the pocket as an extra lens without carrying a bag for the equipment. It is fast, and sharp all the way to the border from wide open. Colours are rendered well. Very solid construction.
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99