A Pentaxforum user (Click here) had the luck to get and test the new Panasonic Nocticron 42,5mm f/1.2 lens. Many image samples and aperture tests can be seen on his Flickr page (Click here). He writes:

    It’s quite large and heavy. I’d say the barrel is larger around than the 75, and it’s definitely a bit heavier. The whole thing is made of metal, and there’s an actual aperture ring with nice click-stops (though it doesn’t appear to function with my OM-D). The hood is super long, and also made of metal.
    AF is pretty quick and very accurate. Bokeh is great for m43. Seems very sharp wide open, though there’s a loss of contrast. Some green LoCA, but nothing major.
    Also confirmed that the aperture ring works on Panasonic bodies, but not Olympus. I assume this can be fixed with a firmware update.