I really don't care about anything 5G mobile. When it comes to the speed advantage of 5G on a mobile phone, I just consider it a gimmick. I would much rather have good coverage of 4G LTE than spotty coverage of both.
The most interesting thing of 5G, and could probably have the biggest short term impact in the US, is 5G fixed wireless access. Hardly anyone is talking about this, and I don't know why.
I have been using Verizon since the launch of the iPhone 4s, and they used to be the best network in my area, but something happened about 2 years ago, and their LTE service started to suck, big time.
Considering LTE isn't going anywhere for a long, long time, lets get that working first, then worry about 5G.