On a particular trip to the mountains I shot three different 120 films on the same trip : Pan F @ 25, Ekfe 25, and Rollei Pan 25. They were all quite different in terms of characteristic curve. Pan F has an exaggerated S-curve with limited tonal range; Efke 25 had an exceptionally long range due to its very long relatively straight line - up to 12 stops without need of compensating or minus development; and Rollei was somewhere in between, with considerably less shadow gradation than Ekfe, but distinctly more than Pan F.
That distinction was quite important working in that environment. A film like Pan F could be lovely under mist or falling snow, but was relatively worthless once the sun was out and the scene contrast range very high. But Efke handled that kind of situation wonderfully.
The Rollei product was suitable for more average conditions, but had quite a few little annoying artifacts visible in the skies; I didn't care much for it overall. Efke's quality control didn't deteriorate until near the end of their whole facility. Pan F-plus obviously still exists, with its own special look.
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