If you want a wide angle prime lens, then the XF 14mm f/2.8 R is the widest you get of the Fujinon wide angle prime lenses. With a focal length equilevant to a 21mm on a full frame lens, or 89 degrees angle of view, only Fujifilm’s 8-16mm and 10-24mm offers you angles more wide than this 14mm prime. But have in mind that the former is much more expensive and more heavy to drag around, and the latter only has an aperture of f/4. If you want something bright and light, then the XF 14mm f/2.8 R is the choice for you.
But what can you use this lens for? Landscape and cityscape are two connected uses for a lens this wide, but with a focusing distance of 18 cm and very little distortion, this lens can both be great for detail shots of objects, which you want to add a surrounding narrative to, as well as architecture. It even be an interesting lens to use for street photography, even having distance marks for zoom focusing.

 

To purchase the XF 14mm f/2.8 R, follow link for below option/s:
Amazon

Specs:

Focal Length 14mm (35mm Equivalent Focal Length: 21mm)
Maximum Aperture f/2.8
Minimum Aperture f/22
Angle of View 89°
Minimum Focus Distance 7.09" / 18 cm
Maximum Magnification 0.12x
Optical Design 10 Elements in 7 Groups
Diaphragm Blades 7, Rounded
Image Stabilization None
Filter Size 58 mm (Front)
Dimensions (ø x L) 2.56 x 2.3" / 65 x 58.4 mm
Please see Fujifilm’s official page for the XF 14mm f/2.8 R prime lens here:

Check image examples on Flickr.

Product Images:

5050travelog review of the XF 14mm f/2.8 R prime lens:
Fujifilm XF 14mm f/2.8 R – Lens Review

Alik Griffin review of the XF 14mm f/2.8 R prime lens:
Fujifilm 14mm f2.8 Review & Sample Photos

Fuji vs. Fuji review of the XF 14mm f/2.8 R prime lens:
Fuji vs. Fuji’s FUJINON XF 14mm F/2.8 R Review

Sans Mirror review of the XF 14mm f/2.8 R prime lens:
Fujifilm 14mm f/2.8 Lens Review

Fujilove Magazine review of the XF 14mm f/2.8 R prime lens:
My thoughts on the FUJI XF 14mm R

Optical Limits review of the XF 14mm f/2.8 R prime lens:
Fujinon XF 14mm f/2.8 R (Fujifilm) – Review / Test Report

DPReview review of the XF 14mm f/2.8 R prime lens:
Fujifilm XF 14mm F2.8 R review

The Art of Photography review of the XF 14mm f/2.8 R prime lens:
Fujifilm XF 14mm F/2.8 R

Photo Review review of the XF 14mm f/2.8 R prime lens:
Fujinon XF 14mm f/2.8 R lens

PCMag review of the XF 14mm f/2.8 R prime lens:
Fujifilm Fujinon XF 14mm F2.8 R Review

ePhotoZine review of the XF 14mm f/2.8 R prime lens:
Fujifilm Fujinon XF 14mm f/2.8 R Lens Review

Belowzero review of the XF 14mm f/2.8 R prime lens:

FUJIFILM XF 14mm f/2.8 R Lens Review

Damian Brown review of the XF 14mm f/2.8 R prime lens:
Fujifilm Fujinon XF 14mm 2.8 R Real Photographer LENS REVIEW

Bigheadtaco review of the XF 14mm f/2.8 R prime lens:
Review: Fujifilm XF14mm f/2.8 R

Chris Boland review of the XF 14mm f/2.8 R prime lens:
Little Review – Fujifilm XF 14mm f/2.8 R Lens

Phil m Photographic review of the XF 14mm f/2.8 R prime lens:
Fujifilm 14mm 2.8 REVIEW – Real World Review Test

Chris Paul review of the XF 14mm f/2.8 R prime lens:
FUJIFILM XF 14mm f/2.8 R Lens Review and Images

Mike Kobal review of the XF 14mm f/2.8 R prime lens:
Fujinon XF 14mm f2.8 R review, watch in Full HD

Digimanie.cz review of the XF 14mm f/2.8 R prime lens:
Fujinon XF 14mm F2.8 R 4K60p Handling Review with Samples

iThinkPhoto review of the XF 14mm f/2.8 R prime lens:
Fuji XF 14mm f2.8 Lens Review