1. The structure of the lens is different.
2. The coating of the lens is very important for color reproduction.
3. The glass of the lens and the formula of special glass are different.
Panasonic has cooperated with Leica, and Leica only authorized Panasonic to use Leica's lens structure patent. As for the technology and formula of glass and coating of Leica lens, Therefore, the imaging of Panasonic lens is only close to Leica, because the structure is similar, but there are great differences in color, depth of field, astigmatism, sharpness, level and contrast. If the score of Leica lens is 9, Panasonic can achieve almost 7 if it is serious, but it is impossible for Panasonic to do a certain lens seriously. That is not Panasonic's main business. Leica's main business is to make lens cameras.