What Difference Will A 4k Capable DVD Player Make?

Mitch - I suppose the answer is: "future-proofing" (and bragging rights)

Call the mfgr. of your projector and ask for tech support or a tech rep. Tell them you have some questions and see if you get a straight answer. Has the projector been reviewed by any competent writer you could contact? They usually do a lot of tests.

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Nah Tom, my projector is five years old and out of production, I doubt any rep wants to talk to me about it. I posted this to see if anyone with a 4k dvd player or a 4k capable pre-pro got a better image on their 1080p projector.

By the time 4k becomes commonplace in tv's and projectors, all of the current dvd players will be out of production and the new models will be out. So, I think it's like Mateored above said..the whole 4k hubub is about bragging rights, because currently, there is no practical use for it if it doesn't improve the image on 1080p tv's and projectors.
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Mitch, I think you have answered your own qustion. Regardless of your source, you can't get any better than what your PJ will display. If 24K is the cost to get there, thats what you have to do. If it were me, I would enjoy what you have for the moment. Elizabeth is right. So, are you an everyday consumer, or not?

Elizabeth is correct, it doesn't matter that she said "TV" instead of "projector". Both are digital display devices. Most likely your projector will not even be able to accept the 4K output from one of the new Oppo players, or any other 4K source. Also, displays cannot output above their native resolution, only below. So the native output of your projector is likely 1600 x 1200, although it can accept 1024 x 768 (which of course it scales to 1600 x 1200 for display).