I agree with andrewlee. I want the 16, but I've got the 14, 18, 23, and 35. The 18 is a really usable focal length. Low distortion, fast, balances great on X-E bodies (23 is a little heavy). There's more overlap between 18 and 23 than 23 and 35 IMO, and the 18 allows you to get wider and crop if necessary, without distortion worries. I think the 24mm focal length would be better if you need greater depth of field in low light wide open, or for landscapes.
Honestly on your X-E I think the 18 is the way to go, especially for the money.
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