Recently, I read many discussions around 5G SA mainly really on mmWave spectrum which is Unique to 5G technology, as mmWave or millimeter Wave is the most capacity spectrum band so far among all available mobile spectrums.
Yes, 5G high bands (mmWave, also referred to as FR2) are found in the range of 24GHz to 40GHz. They deliver large quantities of spectrum and capacity over the shortest distances. They also use massive MIMO to expand capacity and extend coverage. Moreover, they include wide spectrum segments available for 5G along with lower latencies. However, due to its coverage and the need for more sites, it can be not globally implemented. As per Analysys Mason, South Korean MNOs have struggled to find a commercial case for the mmWave spectrum due to a lack of device support.
As per the last report from GSA (Global Mobile Suppliers Association), Selected sub-6 GHz frequencies are increasingly well supported in 5G SA devices. The pattern of most-supported bands in sub-6 GHz 5G SA devices largely matches the pattern for most-supported bands across all 5G devices, with C-band, 2.6 GHz, 2 GHz, 700 MHz, and 1.8 GHz known to be catered for by most devices.
Conclusion
Support for a millimeter wave is not yet common. Chipsets are being developed to support this capability, GSA has currently only cataloged 15 mobile processor and platform chipsets specifically supporting 5G SA in the millimeter-wave spectrum.
5G SA is independent on mmWave Spectrum, You can go with 5G SA with Sub 6 spectrum