I just shot a roll of FP4 Plus in my Pentax ME Super SE. I forgot it said "Plus" on the film, till I checked one of the unexposed rolls of it I have. Since I'm not developing film now, and don't have any way to scan negs if I did, I mainly send B&W film to Old School Photo Lab in New Hampshire. I've previously sent them Fomopan 100 and Tmax 100.
The scans always look good. I will tweak some of them a little, but mainly just to get a bit more detail in highlights or shadows. The very basic software I use doesn't do sharpening. I don't know what auto or operator adjustment might be getting made when Old School scans. Although the grain is different between the FP4 Plus and the two other films, the scan results look comparable quality-wise. Old School's website currently says they process B&W film "with Clayton F76+ developer; we adjust our processing for the specific film type and speed you use." ***Actually, I always shoot negative films at 1/3-stop lower iso than they are rated. I didn't tell Old School, I shot the FP4 Plus at 100 and not 125. I just hate thin negatives.
I'm not doing a commercial for Old School here. There might be better places, and there certainly are more expensive ones. I did find a few spots from lint on a few of the scans this time, so I'll tell them to be sure the negs are clean next time. Here is one of their scans I really couldn't improve on. The shot was taken at f/8, 1/1000 sec, with a Sears/Ricoh f/1.7 50mm. Old wood-framed grain elevator at London Mills, Illinois. (cross-posted)