How dense is SRAM compared to random logic?
You can get a very rough idea from the published transistor densities, with the caveat that real products are often dramatically different then isolated cells. For example, TSMC 7nm has a 0.027 square micron SRAM cell. That's 222 million transistors per mm square:
https://en.wikichip.org/wiki/7_nm_lithography_process
Conversely, they claim only about 90 million transistors per mm square for logic, so more than double the density.