Depends which flavor of 5G you are talking about. mmWave is still terrible unless you are right next to a cell. Midband is slower, but a huge improvement over LTE, and uses adjacent bands in many cases.
Verizon and ATT pursued a mmWave first buildout, and now they are catching up on midband. That’s why the C-band issue was so huge last year for them. Unique in the US, T-Mobile did midband-first (it was the point of the Sprint merger —- to get Sprint’s frequency licenses that were good for midband), and they have the most useful 5G network, mostly because of availability.
Verizon and ATT pursued a mmWave first buildout, and now they are catching up on midband. That’s why the C-band issue was so huge last year for them. Unique in the US, T-Mobile did midband-first (it was the point of the Sprint merger —- to get Sprint’s frequency licenses that were good for midband), and they have the most useful 5G network, mostly because of availability.