Do RAW shooters use the Fuji X DR enhancement feature?

Yes, but seen the immense praise the X-trans sensor has got in many reviews, for ISO800 (a medium ISO speed these days) this is by no means "great" - it looks good as a whole image, but noisy when seen in enlargement.

The old S5pro was certainly not worse at ISO800, actually it would have done the same scene in ISO100 or 200 and with enhanced DR (400% anyway).

Bernie (who also has an X-E1)

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'All the technique in the world doesn’t compensate for the inability to notice.' (Elliot Erwitt)