The Pentax FA 43mm has an average review score of 86.7%

Score (%):
Pentax SMC-FA 43mm f/1.9 Limited - Review / Test Report
Similar to its cousins (DA 40mm f/2.8, FA 50mm f/1.4) the Pentax SMC-FA 43mm f/1.9 Limited is a very good performer with a few weaknesses. At f/1.9 the contrast and resolution is somewhat soft but beyond the quality is superb and probably as good as it gets on the K10D.
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70

Pentax 43mm f/1.9 Limited SMC P-FA
Well where to start, bought this lens as a walkabout lens, and because I wanted a fast lens when indoor situations demanded it. I have so far not been disappointed. This lens is among the best I have seen. Crisp, excellent bokeh, fast and razor sharp. Even a very smooth manual focus.
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100

SMC Pentax-FA 43mm f/1.9 Limited Lens Review
Although a fairly unusual focal length for APS-C DSLRs the 43mm proves to be a versatile lens with excellent imaging properties. It is fairly expensive, but suggests comparison with Leica quality at a fraction of Leica prices.
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90