Seems, Stefan Klenke is one of those luckiest people who have been entrusted by Nokia with 808 pureview’s initial batch, to may be put 41MP monster through different photo capturing conditions and provide feedback to Nokia.
It is nowhere mentioned on his blog that theses streetart pictures are captured by 808 pureview, but if you check the image properties and details, you will not only come to know that these are captured by 808 pureview camera, but also some of the low light samples are with flash and some are without. But only thing common in both of samples are that they are amazing for a smartphone camera.
Without Flash:
With Flash: