[1]: https://news.ycombinator.com/item?id=22163244
The Big Win of 5G is that it can increase load-carrying capacity of the cell system, so if you live in an area where the cell system is frequently overloaded, then you should see an increase in quality. Outside of that, though, I'm not feeling it.
Not to mention the fact that the technology makes the coverage so spotty there's hardly any time you'll actually be able to utilise it.