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I really enjoy my Sigmalux 50. It focuses fast and sure. Bokeh is nice too.
I've used the Sigmalux. Bokeh was very nice but the lens struggled - compared to Canon 50/1.4 - in both focus accuracy in servo mode as well as low-light shooting in one-shot mode, where the Sigma would sometimes hunt and give up while the Canon had no such problem at all. Also, the Canon was noticeably faster to achieve AF lock in one-shot mode compared to Sigmalux when swapping back and forth between the lenses.