I've programmed both PS3 and iPad.
PS3 CPU is OK, the SPUs are insanely fast, however, the PS3 GPU is so incredibly slow, it is a joke.
I don't think there was ever a PS3 game that did 1920x1080/60Hz, simply because the fill rate is not there.
Every popular PS3 game renders at a VERY low resolution (often LOWER than 1024x720) and would scale it up to 1920x1080.
Even then it cannot do 60Hz.
The iPad GPU is blazingly fast, as it has a fill-rate to match the screen resolution. You can do 60Hz at native resolution on iPad, you can NEVER do that on PS3.
The PowerVR tile based rendering has a lot to do with this.