With most developers Rollei Retro 80S gives an extrem S-shape curve, especially with Rodinal/R09. Because of this curve shape you get very little to none shadow detail, very dense midtones, high partial contrast at the midtones, and flat highlights.
To tame the curve a bit you have to reduce speed signifcantly (ISO 16-20) and reduce developing time.
I was never really satiesfied with this film because of these reasons.
I have replaced it by ATP (also near infrared sensitisation) and Spur DSX (Agfa Copex Rapid) in Spur Modular UR new developer. Ideal linear characteristic curve, much better tonality, significantly higher resolution and sharpness (its medium format quality with 35mm film), more effective speed (ISO 40).