XF 27mm F2.8. The 27mm lens offers a 40mm equiv. field-of-view, which can be great fun to shoot with. At F2.8 it's not going to give much of a benefit in terms of light capture or depth-of-field compared with a kit zoom. Its major appeal is size: it's convenient and discreet when paired with most X-series cameras.
Buy FUJIFILM XF 16-55mm f/2.8 R LM WR Lens featuring X-Mount Lens/APS-C Format, 24-84mm (35mm Equivalent), Aperture Range: f/2.8 to f/22, Three Extra-Low Dispersion Elements, Three Aspherical Elements, Nano-GI and HT-EBC Lens Coatings, Twin Linear Autofocus Motor, Weather-Sealed Construction, Rounded 9-Blade Diaphragm. Review FUJIFILM null