I think it made heavy use of DX and XNA which is why the 360 and PC versions are very close together, you'd need a very powerful rig to get any improvement over the 360 version.I think Lost Planet might have been too closely tailored to the 360s hardware strenghths to be able to pull off an exact PS3 version.
However, wasn't LP made with the "framework" engine that's meant to have a game look just as good on 360/PS3/PC?