There are few features which are completely new in 5G while features in Legacy technologies are proposed with advance functionalities in 5G.
In order to take a look at the comparison of Legacy Cellular Network and Proposed 5G Network.
Take a look below.
The table is taken from, M. Agiwal, A. Roy and N. Saxena, "Next Generation 5G Wireless Networks: A Comprehensive Survey," in IEEE Communications Surveys & Tutorials, vol. 18, no. 3, pp. 1617-1655, thirdquarter 2016