I have both a PS3 and Pioneer BDP in my lounge. Have previously had a Sony 760 and Samsung unit for comparison against the PS3.
For straight image/sound quality, I couldn't tell the difference.
Actually, let me clarify that, with the Sony there WAS a visiible difference. However, I twiddled with the brightness/colour settings a little and they ended up looking the same. Fairly obvious deduction from that is that some manufacturers are slightly modifying the gamma/colours to make their players look better in side by side comparisons, which is fairly similar to the godawful "display" mode that many new TVs have and use whilst on the shelf at major electrical retailers.
I have a PS3 that's about a year old and runs quietly, so no audible difference on that. I tend to find the PS3 slight more intuitive to use. The only other differences being:
- Many players add 3D now, which you may or may not care about
- Some offer SACD capability, which was the only real reason I bought the Pioneer, as it will output SACD (via decimation) to my AV processor in PCM format. Very nice it is too
- Some players will offer 5.1 analogue outputs, which the PS3 doesn't have. If you have a legacy AV amp/processor, possibly worth considering
- At least two player (Sony 790 and the newer Oppos) include dual HDMI outputs, useful if you have both a projector and TV