China's land area is approximately 25 times of Japan, def has a bigger network. But the top speed is comparable in current generations[1] except the Maglev.

1. https://www.railway-technology.com/features/the-10-fastest-h...

Comparable and essentially identical for sure, but 30 km/hr slower is slower.

Compared to their size, Spain and Japan have a largest high speed network than China.

And tickets, specially in Spain, are very cheap.

I would think that the vast amount of central/Western land in China that is sparsely populated might skew this statistic quite a bit, where Spain and Japan don't have that.