When f 2.8 already very sharp in the center, at 5.6 even right into corners.
The AF is very fast and also sits very well. Is not too loud but still audible. (Interferes only when filming in extremely quiet environments)
Practical experience
The size of the lens corresponds to the 40mm of the STM and is optimal for eg. the EOS 100D.
The images are created very good.
From the picture quality you get with her your everything out of the APS C sensor.
Andersrum bitet the lens but also nothing exceptional - it is neither useful for portrait as well as landscape / Recordings
Especially for landscapes is eg 18 55 STM IS much better suited - Because you have more wide-angle and sometimes can Ranzoomen if something is too far away.
However, the panel brings 2.8 much light on the sensor so the ISO values can be kept low.
You can take the lens very good standard / everyday shots make even in low light.
