For what it's worth, as a professional portrait shooter I use an 80-200 2.8 in the studio for most portraits.
Occasionally pulling out the 28-70 2.8 for 1/2 length daylight window portraits.
I shoot on a D700 so it's full frame.
The zoom range is very convenient.
It's well worth spending the money on the top end lenses, and
you can get great deals on decent 2nd hand lenses at the Camera Exchange in Melbourne.
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