I'm experiencing banding with the panasonic 14mm f/2.5 as well as the 20mm. You can begin to see slight banding beginning at ISO 1600, I've owned and used a GF1 and EPL2 for the past 2 years and haven't seen any issues with these lenses before, albeit I never used super high ISO's on those older models. Here are some pictures 14mm: 11:11 | Flickr - Photo Sharing! audience | Flickr - Photo Sharing! 20mm: red white and blue | Flickr - Photo Sharing! I do not see banding with my 50mm summicron at high ISO's, so I don't think it's solely my camera's fault.