[Autofocus] Nice compact lens that makes already compact Fujifilm X-E3 an even better walk around camera.

[APS-C] I am using this on a Sony A6400. I wanted a small/light lens to always have on my camera and be ready to go, an auto focus lens was a must as well. This lens meet all my criteria. It feels great on the camera, it focuses very quickly, it has great colors, and it is very sharp, very happy with this lens, I highly recommend it.

[f/2.8] I currently use the 27mm f2.8 which comes out to a 40mm full frame equivalent in my Fuji X-E2S and it is a wonderful combination. It is able to get subject isolation with this length but still be wide enough to capture context in the frame. Great for a travel lens and great for street photography. See some of my same images on my Instagram: @robes.eye

[39 mm (Front)] Excellent lens and exceptional value if you can't afford the Fuji brand. Works great and looks beautiful on my XT-3. Perfect match and perfect pictures

[Sony E] If you are on the fence about this lense for the Fuji, I suggest you go ahead and take the leap. A great priced and affordable alternative to the more expensive Fuji of compaerable specs. I find the AF is fast enough, it opens wde enough for lovely photos even at dusk. (Evening may be a bit of a stretch depending on light sources avail). The best part is it truly makes my camera a walk around Camera. I came from x100 so i was used to a smaller profile and was concerned when I got the xt1. But coupled with this, its totally fine.
TTartisans make decent lenses, I have several manual ones for my other cameras so when I heard they had one with AF and it was a virtual pancake, it was a no brainer. I also Love the manual control over aperture, it clicks and moves quite smoothly and helps make the transition from x100 smoother for me. Overall I recommend it for those on a budget or who want a light weight alternative.

[7] I received this lens about 2 months after getting the Fuji 27mm f/2.8 R WR lens. Both lens are sharp, although there were a couple of noticeable differences in the two lenses:
1) The TTArtisan lens appeared to be slightly wider (shorter focal length) than the Fuji lens.
2) Both lenses are not completely silent. Whereas the Fuji lens is known for having AF noise, the TTArtisan lens has aperture noise. If you set the aperture to f/2.8 and there is low light, the aperture stays at f/2.8. Otherwise the lens makes some noise as the aperture adjusts to the scene. Note that this aperture noise, on my sample, was more quiet than the Fuji AF noise.
Overall both lenses are excellent, although not silent, and both are small and light. The one plus to the Fuji lens is the weather seal, although at a much higher price point. You will be happy with either lens!

[Autofocus] Small compact lens. Rumors of it not being sharp wide open are false. My lens is sharp at 2.8, aperture ring kinda tight, but not in a bad way.

[5.2 x 5 x 3.4"] Highly capable pancake lens on a Fuji XT5. 27 APSC / 40.5 FF. Very small, very light weight, sharp enough images with no obvious real world vignetting issues. Fast and quiet auto focus (for photos). No idea if it's silent enough for video. Aperture ring is the only negative as it has strong resistance when turning it that I appreciate, but only two small knurled areas to grip the ring. If TTArtisan made a matching sized lens in various focal lengths I'd be very inclined to get them as well.

[7] This lens is fantastic on both my Fuji X-E1 and X-T20. For the price, it's definitely a winner!

[APS-C] I purchased the 27mm Titanium version to match my Xpro 2 graphite and it looks amazing in my opinion! I had the Fujinon 27mm pancake version before and I would say the biggest difference is only weatherproofing on the Fuji version, quality is comparable for my needs. Great buy, thank you.