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Best portrait lens for the fujifilm x e2s?

For portraits on the X-E2S, I'd start with a fast standard prime. The Fujifilm XF 33mm f/1.4 R LM WR gives about 50mm equivalent and is my default for people. If you want a slightly wider view, the Fujifilm XF 35mm f/1.4 R is close in field of view. For a longer, more compressed look, the Fujifilm XF 50-140mm f/2.8 R LM OIS WR covers 75-210mm equivalent at a constant f/2.8.

Whichever you choose, light matters more than the lens. Read portraits for how to place your subject by a window.

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