Yes, CMS 20 is amazingly fine grained.
I have used it and Copex-rapid in medium format as well since it came out last year in 120. Only wet printing it thou, enlarged or 6x9 contact copies.
Copex-Rapid is ISO 50, so its much faster than CMS 20 and more panchromatic kinda film.
Sometimes I scan the 135 CMS 20... but no drum scanner can come even close to resolve its full detail. Even top of the line drum scanners falls apart around reaching Kodak T-max 400 resolution, CMS 20 is out of the question
T-max 100 might suit You better for scanning.