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Optically the F1.4 and 1.8 are very close, the main difference, apart from the body construction, is in the aperture blades. The f1.8 has only 5 blades, the F1.4 has 8.
For astro use it really doesn't matter but for general photography some feel the bokeh (or out of focus effects) on the F1.8 are a little harsh in comparison to the 1.4.
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