I found a couple of new reviews around the web:
A detailed review has been posted by 3D-Kraft (Click here). Many different mini tests canbe found at Soundimagesplus (Click here). Than there is a short review with nic epictures at Gakuranman (Click here). And new Leica DG Summilux 25mm f/1.4 Sample Photos at ePhotozine (Click here).
P.S.:There is a new Nokton 25mm review at Openpn (Click hee to read the google english translation). Image samples can be found here. There are plenty of lenses in Stock on eBay (Click here).