Korea will lead the world in 5G

The GSMA Mobile Economy 2018 report, along with its regional report, The Mobile Economy Asia-Pacific 2018 contain some interesting projections.  Both reports analyze the time frame from 2017 to 2025.  Globally, the reports project likely trends.  One of these is that the Asia-Pacific Region will lead the transition to 4G and then 5G. 
The graphic (click for a full size version) reveals the report's finding of greatest interest to me.  It is from the Asia Pacific report and shows that South Korea is currently the world leader in 4G and smartphone adoption, and is projected to lead the way on adoption of 5G as well by 2025.  I've chosen to include data for Japan in this graphic because it is the country most closely positioned to compete with Korea.   For further detail, read the GSMA reports, linked above.