Is there a difference between Panasonic Leica lens and Sony Zeiss lens and original Zeiss Leica lens?

Panasonic Leica is designed and manufactured by Panasonic, supervised by Leica, 100% Japanese Panasonic technology and raw materials. Leica is just a consultant, Leica logo+Panasonic optics, who knows.

The original Leica is designed and produced by Leica, and the raw materials (glass and coating) are manufactured by Leica itself. It is patented and formulated, and it is one of the strongest optics in the world. It is the only one without a semicolon.

Sony Zeiss is designed by Zeiss and made by Sony. Japanese glass is used for low-end SOAI, and Germany is short for high-end SOAI. T-coating of all lenses is produced and provided by Zeiss in Germany, which is no worse than German goods.

Original Zeiss and German Zeiss basically do not produce photographic lenses. They are all authorized by design patents, providing technical guidance and original materials, which are made by others (for example, ZM Zeiss of Leica is made in Japan, Zeiss of YC and G is made in Kyocera, and Zeiss of E is Sony). Although the production is authorized, Zeiss is deeply involved. Basically, the optical quality of this Zeiss lens is not worse than the original Leica lens.