A member of the dpreview Micro Four Thrids talk forum made some comparison shots with the Leica branded D Summilux 25/1.4 Four Thirds lens and the Panasonic Lumix G 20/1.7 Micro Four Thirds lens. As was to be expected, the Summilux has substantially less depth-of-field wide open, rendering much more heavily blurred out-of-focus areas. On the other hand, the Lumix is easily as sharp as the ‘Leica’ wide open.

Ah … I love this kind of useless but fun comparison stuff! 😉
And in case you didn’t know, I made a similarly useless comparison once between said Lumix 20/1.7 and the Cosmicar/Pentax 25/1.4 TV lens.