Some Canon EOS R users have reportedly experienced banding issues with their new camera.
Michael The Maven discovered that artefacts appear as banding in RAW files when lifting shadows. After Canon release firmware ver. 1.2.0 for the EOS R, Michael tested again and compared firmware ver. 1.1.0 vs firmware 1.2.0., and found that the banding issue was gone.
Most user will likely never have an issue with banding but we recommend you update your EOS R asap.
Canon EOS R:
Asia & Australia: AliExpress, Amazon JAPAN, Amazon CHINA, Amazon INDIA, Amazon AU, Amazon USA, Digitalrev, Adorama, B&H Photo, eBay Australia, Rakuten JP
Europe & UK: Amazon DE, Amazon UK, Amazon FR, Amazon IT, DigitalRev, eBay DE, Wex Photo Video, Park Cameras, Canon DE, Canon UK, Canon IT, Canon FR
USA/Canada: Amazon USA, Amazon CA, B&H Photo, Adorama, Digitalrev, KEH Camera, eBay US, Canon USA, Canon CA, BestBuy