I didn't see any direct compare of PC. BUT I did see actual print, the colors Y/C/M looks very good. Sadly no side by side with OEM
https://www.youtube.com/watch?v=eh5zr7hQIs8
Rose - unfortunately I didn't keep my side-by-side comparison prints from the very beginning of my refilling days. I did the same prints with OEM and IS inks from MIS - that was before Precision colors came onto the scene. I was primarily interested in skin tones. I found that with the exact same printer settings and Canon glossy paper the OEM prints had too warm a skin tone for my taste and the IS inks were closer to what I liked. This was some 11 years ago before I was exposed to custom profiles, etc. Otherwise, the print colors were exceedingly close. Also, with prints of various members of the family some erred on the warm side more than others. Being rather unscientific in my approach, I sometimes do what I had done in the darkroom. A few test prints for something critical, followed by the "keeper" print adjusted to the best test print settings.