If you take the outside before the leaves "Expertenburteilungen", you should see the picture quality even selbt and themselves form against an honest judgment.
I can say to me that I am very pleased with the image quality.
The distortion at 18mm you get these days with almost everyone (Freeware) Photo software under control. This fall mE also only on some subjects.
From 25mm they are anyway no longer visible in images with no straight lines.
In my opinion, these optics has its highest resolving power between an aperture 5.6 to 8.
Dissolve 8 this decreases again.
CA's may noticeably occur at f 3.5, depending on the shooting situation. Aperture values above no longer produce or less CA's than other lenses.
Of course there is no "L"! Yes and? It also sets out the money not as a L.
For a UV filter, which in my opinion represents übrigends only a remnant of analogue photography, you put depending on the manufacturer and size of almost a hundred out ...
Conclusion:
Strong buy recommendation for this lens, if not already included in the kit of the camera.
You just enjoy it. And that's the main thing when photographing!