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| p.1 #4 · 85 1.8 vs 100L for portraiture and other uses. |
For head and shoulders type portraiture, the 100 is as good or better than the 85 in my opinion. You obviously need a bit more room if you want full body shots.
The 85 destroys it in AF speed because of the macro's longer focus throw, but that shouldn't matter in portraiture.
You can always buy a used one, try it out, and sell it if it doesn't add anything.