In many cases it is almost a religious issue, Green Box vs. Yellow Box. Too grainy, Too Contrasty. I don't know that anyone has really taken the time to compare them all and put up visual results from them. While my tests are far from scientific, they are real world. You use a high speed film when there frankly is little light to be had, so speed is king.
Grain is also a concern.
We want to see good tight grain. Luckily most of the uses of these high speed films are for print media anyway, and the grainyness gets hidden in the half tones anyway. The images are 2400dpi scans from the negative. Each image is a 400x400 pixel area of the negative. I also added scans and details on other films from Kodak and Fuji ranging from Royal Gold 25 to Ektapress 1600 for a full comparison of how the 800 speed films compair to faster and slower films.