Higher peak data rate, lower latency, more network capacity are basically the main improvements for phone users. Partially because the whole radio protocol (among other things) was redesigned to reduce overhead and also because of the new mmWave bands which have enormous bandwidth.
Was a massive improvement here. Went from 50mbps down with a decently long delay when loading new pages to 800Mbps with basically instant page loading.
I am not in the downtown core, but and pretty well right in the middle of a 1 million population city. I do believe the 5G tower is on the building right beside mine though, so I may just be lucky.