It's probably best to just wait for the final retail release.
While the difference may not be major, depending on what stage of development code they used to run the demo (depending on how far ahead of gold code the demo was compiled), it's not a stretch to expect the retail code to run a bit smoother with less frame tearing. Oddly, the frame tearing was really only noticeable during cutscenes.
The only thing I noticed about the PS3 screen grabs is that there don't appear to be any true blacks, making shadows appear a bit washed out compared to the 360 screen grabs. Some of the detail on the PS3 appeared more defined, but... no point in quibbling over screen grab minutiae when you have the actual demo and game for reference.
This washed out effect is not visible when playing the demo.
The demo actually measures up well against the PC version when played at the same 1280x720 resolution.
