There are two ways of looking at 4G mobile networks: the precursor to 5G or part of 5G. So 4G coverage, latency and speed might be viewed either as a problem 5G will fix, or part of the way 5G will improve user experience over 4G levels.
If one takes the latter view--that 4G is a part of the 5G experience--then countries with better 4G are going to have better 5G as well. On a speed dimension, that includes South Korea, Norway, Canada, the Netherlands, Singapore, Austria, Switzerland, Denmark, Belgium and Japan, among others.
On the coverage front, South Korea, Japan, Norway, Hungary, the United States, the Netherlands, Taiwan, Hungary, Sweden and India, among others, have 4G coverage that will help them in the 5G area as well. Perhaps the most-surprising fact is that India is among the nations globally with the most-extensive 4G network coverage.
Many other decisions, including capital investment commitments by mobile operators, as well as investments in spectrum sharing and spectrum aggregation mechanisms, will play a key role in determining how much 4G contributes to 5G experience.
But to a degree not true in the 3G era, the difference between 4G and 5G will not be as clear.
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