[JJ_SO]

Thanks for your test and findings. We obviously didn't have the same lens and I tried it only less than half an hour, but I thought I was seeking for flares, ghostings, fringing and all the stuff I knew from the Nikkor - and I was positively "disappointed" not to find these, at least not in a all too obvious way. But maybe I was too careful? When looking at my pictures in the range of 18-24 mm I could not see fiel curvature - but then, the idea occurred when the subject is perspectively, that curvature might even help to increase DoF?

 

Edit: I was looking at your 7 sample pictures and hoping to find some "ghostings" to proof of curvature. Not to defend the lens - I just want to know what it looks like your were talking about?