I have both of those lenses: 85mm is an amazing portrait lens, 24-70 is a great all-around lens. When I travel, I have 24-70 on my D750, 16-35 on my D610 and my 70-200 f2.8 in my backpack. 85 stays at home. When I am taking pictures if my kids (prom, parties, etc) 24-70 on one body and 85 on the second body.
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