The new standard supports more concurrent users by using the available spectrum more efficiently. There are new modulation and timing "modes" that enable better coverage at cell edges and in dense urban environments. There is better support for multi-antenna systems which means better coverage and more efficient spectrum usage. End-to-end latency has been dramtically reduced and the next 5G NR iteration (rel 17) will add a super low-latency mode. There is now a mode for IoT that enbales low-power communication. Most of these changes aren't going to give you 1Gbps downlink speeds but they represent huge improvements over even LTE-A.