My D4 happened to arrive just in time for a trip to Italy earlier this year. I was hesitant to take it with me because I hadn't had enough time to get really comfortable with it. But last minute I decided it would be the camera body of choice, and I'm so glad it was. All of Italy's wonderful museums are dark, and many do not allow flash photography. Using auto ISO I came away with great quality images, never once worried about going super hi ISO.