I'm pretty set on a Marantz CD5003 due to budget, specs, and reading extensive reviews. My question is; is there really that much difference sound wise between a CD player and DVD player?

I have a really nice Harmon Kardon DVD27 that seems to sound fine to me. But I've read people posting that they don't sound as good as a dedicated CD player. Of course I caught the bug again and bought a tube amp that I'm waiting to get in. Right now the power source is a Harmon Kardon AVR340 through Klipsch RF-82's which I love. I'm also building a couple of sets of speakers which I will get into later.

I remember when CD's came out and the difference in sound back then. But that was before DVD's came along. So is it worth paying $285 additional for? I'm also 46 so my ears no longer hear what I once could.

Thanks