Yes Han, I was just looking at the f/11 comparisons from Philippe and it's the same outcome - the Summaron 2.8 and the Summilux are holding the same detail at the end of the scales only the Summaron 3.5 is holding a bit more shadow detail.
I have done a tone curve adjustment to see how much information there is in the shadows:
f11.jpg
My concern with the 3.5 is it's propensity to develop haze/fog which I understand is because of the glass used. If I found a clean, clear sample how does one go about the prevention of haze developing?