Even the sub-6GHz spectrum allocations in various countries don't overlap that much. But yeah, the 3-6 GHz spectrum is going to be the biggest game changer since it will actually propagate okay and doesn't have the phase noise problems of very high frequencies. https://www.microwavejournal.com/articles/31757-global-5g-ru...
What does that mean? The 5G NR in the future will be reformed from the current LTE, and aren't we all set for mmWave AND 3.x Ghz Spectrum for 5G? I think that is what the majority of EU, South Korea, Taiwan and China are doing. I am pretty sure that is what US and Canada are doing as well.