I first wrote: 4G 1.2 gigabits. 5G 1.5 gigabits. This is one of the first apples to apples comparison, both running on the same Samsung Galaxy phone. These are plausible figures for sub-6 GHz LTE and NR. The best available projections are that 5G in theory would be 19-51% more capable, so this was plausible.
The question mark is there because it's possible the 4G might actually be a third more efficient than the 5G. Cho Mu-Hyun at ZDNet discovered the LTE was three bands, presumably 60 MHz, with 4x4 MIMO antennas. The most common 5G testing uses 100 MHz. Adjusting for the spectrum difference would result in the 4G being a third more efficient than the 5G.
SK combined the 4G and 5G signals for a total of 2.7 gigabits in their test. That would be a remarkable advance if ready for market. I don't know anyone else doing similar. Samsung and SK haven't yet answered my questions about how much spectrum and product availability date.
Far too many companies, from Swisscom to Qualcomm to Verizon, refuse to provide basic information with their releases. Verizon won't give a meaningful answer about actual speed or about how many cells are deployed or the percent of the population covered.