This is a superb lens! You can expect extraordinary sharpness right from wide open. Smooth Bokeh and no, and I say again, no chromatic aberrations. The lens distinguishes itself by having excellent separation of the subject from the background, it’s very 3D. Colour contrast is high and images need very little processing when coming from dng files. The lens has a very special look, especially at mid-distances. Close up performance is also very good, due to the floating element. Close up images still retain interesting bokeh as well. Check out the parrot shot below. Vignetting also serves to enhance image quality ( I know that some will disagree), but I really like this lens and its output.
This is the last version prior to the Summilux Asph. Designed by Peter Karbe, it sort of transitions between ealier Mandler designs and the current Asph, which is also designed by Mr. Karbe.
It is a 7 element, 5 grouping design with a 12 blade aperture mechanism. This mechanism yields almost perfectly circular bokeh throughout the aperture range. You can expect half click stops between the aperture settings.