WP_User_Query pulling ACF to loop

As I know or at the moment of the last time I checked, ACF doesn’t meta-data in their “best” location, as in get_term_meta, or meta data for users.

Instead of that, Elliot did a very strange thing, but focusing in what you’re asking for:

get_field('your-field','user_' . $author->ID);

So the loop you will have to add something like above, check out more in his tutorial: http://www.advancedcustomfields.com/resources/how-to/how-to-get-values-from-a-user/