MR reports that a major complaint of iOS 8 was that it took 4.5GB of space to install while iOS 9 takes about 1.5GB to install. That's to install. What are the actual footprint sizes of the OSes themselves? It would be a great benefit for me and my 16GB and 32GB devices to upgrade from iOS 8 to 9 if I were to gain back 1-2GB of free storage space for my music and pictures. But if the OS footprints are the same (or 9 is larger than 8), then it's not worth the upgrade. Thanks!