39MP - what can you see

I experiment with medium format camera today with a resolution of 39MP. So, exactly what can one sees other than a huge File? The full resolution picture is reduced to this...
... 1024 pixels across. This is reduced (resized) on purpose as I don't want to waste my limited free space on blogspot. (Click on the above picture to see a bigger image).
... the edge of the wall which I cut it out to show full resolution. Click on the image to see the full size. Your comments are most welcomed.