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.
I can’t tell the difference in everyday usage. Speeds are surely as fuck ain’t any better.
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 never seen anything nearing 800mbps for cell phones outsid of corpo propaganda but maybe your area is not as congests as tests in major cities