Jeff Cable has released a blog with high iso images from all four cameras.
ISO testing of the Canon R5 and R6 (and comparing them to the Canon 1D X MKIII and 5D MKIV)
Jeff Cable Photography, Canon, R5, R6, Real world, Test, Review, ISO, High ISO, Comparison, 1DX, 5D, Metering, Test
blog.jeffcable.com