very high ISO Hen Harrier

on a very dull night well after sunset a beautiful male Hen Harrier appeared so just for a laugh I cranked the ISO on the Canon 5D4 up to 20,000 ISO -- yes they are silly noisy and at 1/200th second witht eh 400 DO and 1.4x not likely to be very sharp but I was still amazed by the amount of detail visible in such lightless conditions --