As Benj Haisch had a chance to extensively test the lens, I'll let him go through the pros and cons of this Sigma 23mm f/1.4 DC DN Contemporary lens for the Fujifilm X mount. Instead, I'll offer you some reasons why this lens is so appealing.
23mm might seem like a strange focal length to choose and yet there are lots of options. Well, 23mm on an APS-C crop sensor is equivalent to 35mm on a full frame camera, which will go a way to explaining why it's 23mm. But that moves the question to "why 35mm?" A fast (by which I mean a wide maximum aperture like f/1.4) 35mm prime lens ticks a lot of boxes. It is a versatile focal length as it's wide enough to capture a scene, but long enough to separate the subject from the background if you choose. They are typically compact which makes them easy to sling into a camera bag. The speed makes them useful for low-light performance and creative decisions. Finally, if they are manufactured by a brand different from the camera (or Zeiss), they can be affordable.
At $549, this Sigma certainly ticks a lot of those boxes, although it is a little bigger than I expected. What do you make of it?
