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I compare the Canon EF 50mm 1.4 USM to the EF 50mm 1.8 II in this video. Feel free to leave any questions or comments!
[UPDATE] Forgot to add that the 1.4 renders bokeh a lot more smoothly than the 1.8. It also has 8 aperture blades instead of 5 so you dont get bokeh pentagons when you stop it down. View sample shots here http://zhchphotography.blogspot.com/2013/06/canon-ef-50mm-18-ii-vs-14-usm.html
My channel: youtube.com/zhch15
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Written review here: http://zhchphotography.blogspot.com/2013/06/canon-ef-50mm-18-ii-vs-14-usm.html