<p>I had the 50 1.8 and thought I lost it, bought the 50 1.4 and very happy I did. Found and sold the 50 1.8. The 50 1.4 does not get much respect but it is much better than the 1.8.<br>
1.8 - Cheap toy build quality, hunting & coffee grinder focus, the pentagon shaped bokeh is hideous.<br>
1.4 - Good build quality, quick and quite focus, nice bokeh with 8 diaphragm blades. <br>
Buy the 50 1.4 it's worth the upgrade if you use a 50mm much.</p>