Hdmi Upconverting Dvd Players Good As Blu-ray What Is Difference Between A Upconverting 1080p DVD HDMI Player And A Blu-ray?

What is difference between a upconverting 1080p DVD HDMI player and a blu-ray? - hdmi upconverting dvd players good as blu-ray

I'm tired, that Blu-ray / HD-DVD war. I know there are some players who have both formats, but why so much money on new players and new films, if you just buy a 1080p upscaling DVD player with HDMI? I think my question is, will the quality of unpconvert be as good as Blu-ray / HD-DVD versions?