What wasn't mentioned by Batpig is the differences in colourspace and clipping. The Denons have faults. The Oppo's have all passed on all colourspaces and clipping tests.
So there is some differences there also.
I have the OppoBDP-83, PS3 slim and the Denon 1611. The Oppo and PS3 is better than the Denon on picture. They pass the Denon dosen't.