CMS 20 and Spur developer is best match, shoot at less than ISO 10.
Most scanners would be challenged to scan CMS20 negative at best, so most of what You see on the net is not even close to the real result on negative (or decent optical print).

As Uwe mentioned Agfa Copex Rapid is another option, much faster and exceptional scale.

These are the 2 films Zeiss AG Camera Lens Division are using to benchmark their optics.