I have no idea about this picture, but last Christmas I saw some raw, behind-the-scenes video of Mi:4 and Cruise was hanging outside the Burj, 120+ stories up. My sister was Brad Bird's PA and traveled all over the world for this film (also went to Prague and Vancouver). I saw hundreds of photos and hours of video (funniest stuff I can never be allowed to share). He was there and as I recall, she told me he did the vast majority of his own stunts on this one. I saw the video myself and as my sister was actually there, I know he did most of those shots you'll see in the film.
As to this one, again, no idea. Could be photoshopped. But the video shots I saw - he looked relaxed as hell hanging outside that building.