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I don't think Leica lenses particularly have it, in general, although I will try to provoke it in the next little while, just to see. They have great subject isolation though. The two lenses which I often see it in are the Contax 35/1,4 (close up) and Contax 100/2 Planar. Lots of Zeiss lenses don't have it, at least that I have seen. My Hasselblad 110mm f/2 has it (a Zeiss lens), but then it is very similar to the 100/2 Planar.
The Leica S2 lenses seem to have it, although there are few samples so far.