Apparently they are both made in the same factory by Panasonic in Japan to Leica specs but cosmetically they are different. The Leica version has 14-50 in the classic Leica yellow and the MegaOIS words are smaller. Also the words on the front of the lens are arranged differently. Not sure if those are the only difference. Leica never claims that their version is superior but the one on the L-1 is really superb so I doubt there's any difference optically. Can only wait for it to be released to compare IQ.