The patents has a pie chart.

One chart shows the density of 5G installations in Germany, China, Japan, and the density per 10 square miles:-

Germany 5.3
China 5.1
Japan 15.2

IMHO, this tells the obvious that the Germans want to be there on day 1 when this 5G is rolled out, they will not wait. Just like China and Japan.

Do not know whose gear Japan is using. Since they have 3 times the density of antennas, all that means is their antennas suck compared to Huawei antennas.

Huawei, 5G and the Fourth Industrial Revolution