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To answer your question in this instance less is more. Film based Blu-rays are mastered at 24 frames per second and you will get the best picture quality if your TV is able to display a Blu-ray at 24hz. If it displayed at 60hz there would be a conversion process that could compromise the picture and introduce artifacts and make diagonal lines look jagged.
Why is this? Film is 24 frames per second. Standard definition video is 30 Frames per second and HD video is 60 frames per second. Don't equate a higher hz with a better picture. A 1080P Blu-ray at 24hz will look better than most HDTV signals at 60hz. Since most TV is video, TVs are designed to display things at 30 or 60hz.
For some reason if you want to have the signal converted from 24 to 60hz, you would need to change the video settings in your PS3.
