I'm really contemplating picking up a 24-70 L 2.8 for my live music shots as well as some fashion/glamour that I am working on. Does anyone have any experience with this lens in low-light situations or will I still be using my 50mm 1.4 and 20mm 1.8 alot?

It is a great lens but as Narlus points out it is really not particularly fast. Are you not happy with your 50mm f/1.4?
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