I purchased the 35mm f1.7 to use with my xt20. I wanted a small and neat option for a family holiday and this combination fit into my tiny bag previously occupied by my x100. I found the lens rings for control of focus and aperture were easy to use. Manual focusing with focus peaking was relatively easy and accurate. I was happy with the sharpness and quality of the holiday shots, from bright sunshine to night time. My one negative point is that I found the colours to be a little inconsistent even for the same scene and not on par with the consistency of colour quality from a Fuji lens such as the 18-55. However, I would have no hesitation in using this lens again for low light photography or as a very neat travel lens. Longevity has yet to be established but this lens did not disappoint and was great value with fast delivery.