5G is not 5G is not 5G. 85+% of 5G will be mid and low bands, below 6 GHz. Typical speeds will be 100-400 megabits. In the U.S. Sprint holds a huge chunk, well over 100 MHz. China Mobile has 160 MHz. They can, and probably will, have better 5G than all but a handful of carriers who are doing mmWave. Huawei is ready to deliver equipment for maximum performance at 2.6 GHz.
Europe and Japan will do almost all of their early 5G in 100 MHz or less of 3.5 GHz spectrum. Higher signals, such as 3.5 GHz, fade so rapidly that until recently this band was unusable for broadband. With Massive MIMO, 100 MHz of 3.5 has the performance of 20-40 MHz in lower spectrum - with a spectrum cost of a quarter or less most places.
2.5 GHz has much greater reach, especially with Massive MIMO antennas.