YongNuo 50mm f/1.8 vs Canon 50mm f/1.8 II

The Canon 50mm f/1.8 II(http://bit.ly/EF_50mm) is what some people affectionally call "The Nifty Fifty". But the YongNuo (http://amzn.to/1bAhe16) comes in at a significantly lower price point, potentially making this niftier - could this fast prime lens be a better choice for your wallet than the Canon lens?

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