One does gain more noticeably in picture quality but a good up converting DVD player does bring std def DVD comes fairly close.
I see this said a lot.
Even overcompressed TV channels that are natively hidef look better than natively 480i DVDs thru Anchor Bay, Reon, whatever. Give me a break.
Anyone who says this most likely has their display and/or viewing angle as the weak link in the video chain.
480i DVD gets you 337,920 pixels.
1080p bluray gets you 2,073,600.
Upconverting does not magically or accurately create the 1,735,680 missing pixels.
If you honestly think they are even close, then it's your display.
If I have a crappy pair of Bose speakers, how would you consider a statement such as, "CDs and SACDs are simply not worth the premium over mega compressed MP3. I can barely hear the 614% increase in resolution."?
I have a big enough quality display, then even a bad bluray blows away a good DVD. You compare the same title, 99.9% of the time it's not even close. And btw, I do have Anchor Bay at my disposal.
In case you think my screen is too big, I've had a play/stage manager (film degree), a playwright working on a comic book in NYC (film degree), a former employee of ToddAO, and a DGA director (of +10 years, works internationally) come over, and they all say the viewing angle is perfect.
Now, yes, I know I am very lucky to have a setup such as this, but just because you do not, you cannot say that bluray is a marginal improvement over DVD.
IOW, the source is not the weak link here, it IS the display.
Check this out. VHS has 250 horiz lines of resolution. DVD has 480. BD has 1080. Therefore:
DVD increase of horizontal lines over VHS is 192%
Bluray increase of horizontal lines over DVD is 225%
Now, it would be another thing entirely, if you say that human visual perception cannot discern these differences, assuming the viewing angle is large enough. I hope that's not what you are saying.