You can now compare the size of the newly announced Panasonic Leica DG Vario-Summilux 10-25mm f/1.7 ASPH lens with other MFT gears. The lens has been added to the CameraSize database.

Panasonic 10-25mm isn’t as large or as heavy as one would expect, and is very well-built and fully weather-sealed. It’s the first Panasonic Micro Four Thirds lens with a focus clutch and a clickless aperture ring is also provided.
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https://www.dailycameranews.com/2019/06/size-comparison-panasonic-10-25mm-vs-olympus-12-40mm/