A female red tailed cockatoo from yesterday. Iso was 6400 and shot is heavily cropped so lost some contrast, sharpness etc as it needed a fair amount of noise control ( topaz).
Prior to R5 the highest iso I would go to was 1600 on a heavily cropped image(70%+) and then it was marginal if it was useable. Would never have envisaged a heavily cropped image like this( approx 80% crop) being useable at 6400. Especially on a full frame sensor over 25mp. That was problem with my old 5DSR. WHilst it had the megapixels it didnt have good iso performance to go with the MP like the R5 does .