I currently use the Olympsu 14-42EZ lens in a 29mm port with the GH5. Overall, I think the quality is nice, but I wonder if one of the other kit lenses might not produce better results?
I recently had to use the Panasonic 15mmF1.7 prime (in the same port), and noticed that the image quality was indeed improved, especially the corners, which were sharp even at F2.0. So clearly the lens you have behind the WWL-1 makes a difference.
What's the best standard zoom lens in terms of quality that can be used with the WWL-1? I assume the Panasonic 12-35F2.8, Olympus 12-40F2.8 or the Panasonic 12-60F2.8-F4 wouldn't work, so we're left with one of the kit lenses?