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That's interesting. Can you describe your preference? Is it DOF scale (well, it's rather distance scale in case of APS-C) that makes this leica a better choice?
I found I also highly prefer my SE 18 over 10-18 (although I don't own it the zoom, just tried a couple of times) and the main reason is the DOF scale (again, distance scale and learned DOF chart for 28mm lens), using AF only for such a wide lens is quite a limitation, since there's no distance information both on the lens and display.
It is hard for me to describe. Philippe would probably be better able to explain than me (he has used both, too). On the Leica, everything just seems more clear, with richer colors - especially in the distance. My best images with the Sony/Zeiss 24 were taken closer to the camera.
Of course the experience of using the two lenses is completely different. With the Leica, I am slower in my photography, and this is probably a good thing.