The Leica Vario-Elmarit-
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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.
I am working on the review of this wonderful lens, that is sadly discontinued by Leica. It is a very light small lens ideally suited for travel. The nearest modern alternative would be the 90mm F/2.8 Summarit. The F/2.8 Elmarit is available on EBay and if one is careful, you can pick up a very good copy.
Probably the best 28mm F/2.0 lens in existance right now! This is a stunning lens, with NO chromatic abberation, excellent bokeh, and its super sharp right from F/2.0. In fact stopping it down only adds to the depth of field, it does not get any sharper from F/2.0 onwards! A feat of engineering thats for sure. Anyway, a picture is worth a thousand words, so have a look.