Peter,

I don't have an Oppo blu ray, but in the audioholics review of the Oppo 983 they discuss some of the differences between it and the PS3.

Link: http://www.audioholics.com/reviews/transports/dvd-players/oppo-dv-983h/

This would give you a good idea of the differences in the upconverting. The Oppo blu ray however will be able to upscale dvd's to 1080p at 24 fps which bypasses the 3:2 pulldown. The PS3 and Oppo 983 didn't have this feature. Although, only the Pioneer plasmas and some projectors can correctly display a 24 fps input without flicker and other issues.

If you are interested in dvd's and blu-ray's from other than the North America then the Oppo has PAL conversion that the PS3 doesn't have. However, to ensure blu ray licensing, Oppo had to lock the player to only play discs from North America. You can get software for your computer to remove the region encoding from the movie and reburn it to a disc so that you could play any movie from throughout the world. Note: most of Europe and other countries have movies on dvd's at 25 or 50 fps, which is PAL, and incompatible without being converted to either 24 or 30 fps.

- Nick