Originally posted by ChrisPlatt Agfa Optima film was excellent. It was a C-41 color negative film.
Although all color negs were compatible with Kodak's C-41 processing, in my experience using CN-16 for Fujicolor, CNK-4 for Konica, or AP-70 for Agfa, gave slightly better results. (Scotch/3M was always a loser in this situation without their own chems and photographic paper).
When Kodak formulated C-22, which evolved into C-41, their tests were for and with Kodak emulsions. The other three processes are almost identical, but are slightly biased for their own emulsions.
Back in the 80's when I managed a lab, the owner at one point switched us from Kodak chems and papers to Fujifilm (less expensive). Suddenly we found it very difficult to get the same aesthetics and tech specs from Kodak negs. The Fujifilm, however, was looking better than ever.
In the U.S., I had always thought that Agfa had the least realistic palette and typically got funky prints....sometimes neat, sometimes horrible (like Instagram filters). It wasn't until I lived in Switzerland and took my Agfa film to a lab that used all Agfa chems and paper that I got excellent results.
I know they are all cross compatible, but from my experience, I either seek out a lab that's using the chems that match the brand of film I'm shooting, or I will shoot with film of the same brand as the chems (and/or paper) from that lab.