One of the biggest things that we test for with High ISO Output from cameras is how well the images print at 17x22 inches. Sure, everything looks great on a computer screen or on your phone at ISO 6400.
And in terms of practicality, there is no good reason to pixel peep your images because your clients aren't. But they instead care about how the images will look on their wall when printed large. Printing is sometimes seen as a forgotten art, but if you think about how much joy it brings a photographer to see their images become manifest, then you'll understand why high ISO output can be very important. So we went through the Reviews Index and our own printed image samples to see how they all stacked up to one another. . thephoblographer.com