I am fortunate to have both the lenses you are considering and on the basis of what you have said about your subject matter I would take the 24-70 mk2. Both lenses are superb and you will be happy with either but perhaps your limited sports use looses out to the social functions you will be shooting more of and yes the wide end is very useful. Which ever you choose you will be delighted with the quality from the 5d mk3
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