I am really surprised at how low distortion and high quality this is. I am a Sigma loyalist, and I only use Sigma lenses with my FujiFilm APS-C camera. Sigma excels at their primes. But this little, light ultra wide zoom provides almost all the image quality of Sigma’s 16mm prime at a fraction of the size and weight. It’s a perfect street lens, and it looks great on most X camera bodies. This lens is so great, I’d recommend it be the first lens one should buy for their FujiFilm X camera body. In my case, this is the last lens. My glass collection is complete! For my FujiFilm X, I have this Sigma 10-18 and 18-50 zooms, and the 16, 23, 30 and 56mm primes. 6 great lenses.