The new Samsung Galaxy S5 was just launched, but it seems it has an issue, the ROM takes up a lot of space. The Galaxy S5 16 GB model will have only 7.8 GB of freed disk available for users. The official page of the new launched Samsung Galaxy S5 says that the amount of space needed to run the system is 5.28 GB, with other files needed to run the system accounting for 2.33 GB. This situation is similar to the Samsung Galaxy S4, which had only 8.8 GB of free space available for users.
On the other hand, a Nexus 5 that has 16 GB of space has about 12.1 GB available for the user. This is meaning that the software from TouchWiz and other Samsung apps and features occupy another 3.6 GB of storage. The new flagship also comes with a micro SD slot card that can accommodate up to 128 GB. The problem will occur when you'll want to shoot 4j videos, because the space won't be enough. It will hardly be enough on the 32 GB model.