I love the tones/ gradation from both of these films. The RPX 25 seems to have much better quality control versus the 80S with regard to emulsion issues/ cleanliness in my experience thus far. I have yet - after about 20 rolls of 120 using different batches sourced from different places (new and old style backing paper) - seen a clean roll of 80S when scrutinized at very high magnification (4000ppi scan). It's very aggravating as otherwise I like the film quite a bit. I don't have this issue at all with the RPX 25. My only issue with both is dealing with the curl from the archival polyester base. With regard to processing, my best results have been with Xtol 1:1 for 8 minutes with RPX 25 (I seem to gain some film speed with the Xtol) and HC-110 dilution H for 12 minutes with the 80S.