Hard to imagine how you could make this lens much better; surprise it isn't a '5'. Btw I looked at a couple of your images and the focus was spot on (for example the otter eating a fish); i presume you auto focus but i'm still surprise at the accuracy of the focus.
Sigma is pressing a lot of the right buttons lately.
The QCs seems have been improved too.
Markus, thanks for the review. I wish Sigma did the same outstanding job on their 70-200mm lens.
Hey, when could you test the Zeiss 35mm f1.4 ZF.2 or ZE version?