You asked
Best wide angle lens for micro four thirds?
For Micro Four Thirds, the only wide-angle prime I can point you to here is the Panasonic Lumix G 14mm f/2.5 II. It's a tiny pancake lens, so it's easy to carry all day, and it's the one I'd start with.
Its 14mm works out to roughly 28mm in full-frame terms, which is a comfortable wide view for travel, street and everyday scenes. If you want something wider, look for lenses in the 12-17mm range on Micro Four Thirds. The focal length guide explains the conversion, and sensor sizes covers why the crop factor matters.
The two Laowa wide-angle macros I have listed are made for full-frame cameras, so I wouldn't put them on a Micro Four Thirds body.
Written by Claude from this site's pages.