I’m trying the Olympus 12-40mm f/2.8 PRO lens. I like the image quality. On the E-M5 III camera, it brings joy back to my eyes; but, I wish the lens was lighter. If I thought that I could manage when going out with only a single prime lens like either the Panasonic 20mm f/1.7 or the Olympus 45mm f/1.8 lens, I wouldn’t need the heavy 12-40mm f/2.8 lens. An advantage with the 12-40mm lens is that it is weather resident. Do I need that? I’ll think some more about it. Hmm, most of these were taken at 40mm focal length, and it wasn’t raining.