The Pentax DA 15mm Limited has an average review score of 83.3%

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Pentax smc DA 15mm f/4 ED AL Limited review
Its very uniqueness makes it desirable - if you want something a bit wider than the 18-55mm kit lens, but without the bulk of a wideangle zoom, it's your only choice. Like all of Pentax's Limited series primes, it's also a finely crafted piece of kit which is a delight to use - a somewhat frivolous reason to choose one, perhaps, although still perfectly valid in its own way.
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80

Pentax SMC-DA 15mm f/4 AL ED Limited - Review
The SMC-DA 15mm f/4 AL ED Limited is a another desirable pancake lens by Pentax. The lens is capable of producing very sharp and contrasty images at medium aperture settings. At large apertures the border quality is somewhat softer so it may not be the first choice for available light photography (handheld) ... assuming that you can find a better one.
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80

Pentax 15mm f/4 ED AL Limited SMC DA
This a *compact* lens, hence the mitigated sharpness results until you close to f8. Apart from that, I can't find anything bad to say about this lens. It shares with its "Limited" colleagues a really good colours rendition, and its build qualities. And, from f8, the image quality. The DA 15mm Limited delivers all you can await from a such compact lens.
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90