A quick look at some detail differences between Panasonic Leica
and Olympus Zuiko Digital
Four Thirds lenses.
Panasonic Leica lenses for Four Thirds bodies are not very common, but they are highly coveted. Designed and manufactured by Panasonic's own engineers, in Japan, Panasonic's Leica-branded lenses need to meet tight optical quality standards set by Leica in Germany.
Not all Panasonic lenses are branded Leica, indeed only one Micro Four Thirds Panasonic lens...