I have used the 24-70 and own the 50L personally I shoot a TON of low light and really don't like killing the people with flash so I constantly shoot around 1.8-2.2 and get AWESOME results with my 5D3. Now the 24-70 is a better all around lens but if you are willing to do a little more work in your framing of an image the 50L is the way to go.
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