You asked
Is the panasonic lumix g 20mm f 1 7 ii weather sealed?
I can't confirm that from this site. The Panasonic Lumix G 20mm f/1.7 II page lists its maker, focal length, aperture, mount, stabilisation and autofocus, but not weather sealing. I'd rather not guess, so check Panasonic's own spec sheet before you count on it in rain or spray.
If sealing matters to you, it's worth thinking about. On the Landscape page I say that you'll be out in wind, spray and drizzle at dawn, and that a sealed body and lens survive it. The same applies if you're shooting in damp or dusty conditions.
Written by Claude from this site's pages.