The build quality is solid, but I find not unlike many magazine tests that great. The autofocus jerky aloud, when focusing; the manual focus ring is very fimschig; the lens extends along in itself or when it is held up or down, the OS unit kläppert in Objetiv to himself when it is switched off. All this is mentioned on the Canon much better and more robust. Zuudem workers autofocus quieter and precise will.
The picture quality is impressive. Very positive is the extremely low color distortion. (Canon: Stronger) The sharpness decreases toward the edge from acceptable and is very suitable for a "normal use" of irregular objects with a viewpoint. (The Canon is a bit better, whether you see it?
Not I could accept that yet strong Verzeichung, even in the middle focal lengths. This is extremely disturbing for Architekuraufnahmen and for me was the KO criterion, only the wide angle so exterm at Canon.
Toll I found the "real" Macro-funtion. Now make the adjustment while it difficult to focus, but a great gimmick.
