A fellow FR-reader (thanks for sharing) stumbled on a review made half a year ago of the upcoming 7Artisans 27mm F2.8 which we reported about here.

The review, for the Sony E mount version, is in both languages, German and English (the red text is in English) and you can read it at nikolaus-burgard.

His summary:

7Artisans has also achieved a very good “autofocus debut” in the APS-C-Sensor camera-range with the AF 27mm f2.8.

I will briefly summarize the objective test results again:
Very good sharpness in the center of the image from open aperture, excellent from f4.
The edges are sharp from an open aperture of f2.8, but for perfectly sharp corners you have to stop down to f4. The slight midzone dip has also completely disappeared at f5.6.
The microcontrasts are always very good.
The vignette is clear at wide open aperture, but completely negligible from f5.6.
Unfortunately, the distortion is clearly barrel-shaped with a mustache, but hopefully there will be a correction profile from the manufacturer soon.
When it comes to color errors, lateral chromatic aberrations are not a problem at all,
the longitudinal chromatic aberrations can appear in the form of slight green bokeh fringing, but are never problematic.
The lens isn’t bad in backlight, but if you overdo it you’ll get flares and reflections here, too.
The autofocus was “unremarkably good” in my test. The eye autofocus for portraits was also very snappy and fast.

Subjectively speaking, the technically clean, “modernly rendered” images without any annoyances such as outlining or bokeh bubbles really appeal to me; that’s what I expected from a modern “40mm” (fullframe-equivalent). Of course, with these technical parameters of a slight wide angle at “only” f2.8, you shouldn’t expect any shallow depth-of-field miracles.
I particularly like taking photos of people with the 7Artisans AF 27mm f2.8 – and they are easy to achieve because of the good eye autofocus.

Given the price of €149 / $129, 7Artisans can be said to have made a really successful debut in the autofocus world of APS-C sensor cameras – because the performance speaks for itself and the price is sensationally cheap in relation to this.

It might not be a bad lens optically, but sadly the fact that it lacks of an aperture ring is a dealbreaker for me.