Very small? Charlie, the zeiss FE 55 f/1.8 is twice the size of a Lux 50 and that's before you put that large zeiss hood on it. The FE 35 f/2.8 is smaller, but slower and not equivalent in performance to the 55. OP has said AF, electronic aperture, etc don't matter. And I suspect his need for a tele zoom is receding ...
OP has spent two hours in a Leica store fondling the M240. Case closed, he's going Wetzlar
it's not much bigger, weighs less, and I think the flange distance attributes to the difference.
here's a comparison: http://3d-kraft.com …camerasandlenses&Itemid=2
in either scenario, he can adapt it for fairly cheap.
the zeiss totally crushes the leica in optics, it's not even funny.