I must own a dozen or more players. CD, Multi-disk, DVD, SACD, etc. Both my SACD are Sony, both well regarded, one being an C555ES (no slouch of a player). The largest difference in sound reproduction I attribute to the "system" as opposed to the "player" alone. Using a pair of headphones I detect even less difference between players. Yes there is a difference. I own a dozen TT's, and while none qualify as audiophile class, I find several to be respectable. Unlike CD/DVD/SACD, etc. which are typically DD (direct drive), TT's can be friction, belt or DD. Just these differences alone make some sizeable differences in performance. Even if I had the exact same cartridges in all, they would each have distinct characters. And we're not talking "budget" TT's either. Get one of those USB TT's and tell me the difference isn't significant. I agree that the differences, from cheap "CD" player to the next is less so than between cheap TT's and even moderate priced TT's. Between TT's in the same spectrum as CD players, the differences can be even more obvious.
I'm switching to "digital" in the man cave soon. Just need a USB/DAC for my computer. Mostly I like the convenience. Will I give up CD's or LP's? Not too likely. But sure is nice to kick back in the ergo chair, remote in hand, and switch tunes when the desire strikes me, with far greater ease than LP, and even CD. Do I switch frequently? No. But sure beats getting up at the end of ever side of an LP to flip it over, then grab another LP to play after one completes. This of course doesn't even touch on the "maintenance" aspects of LP's.
Have a friend with an Oppo, no two Oppo players. One, I believe, doesn't play SACD, maybe an early unit? I can't make a comparison due to the fact he was running tubes and ESL-63 speakers. I don't believe his system sounded any better than mine. I didn't have a out of body experience or "ooo hadn't heard that before" or "those vocals/instruments weren't present before", etc. No notable change or improvement in stage or imaging. I guess I'm too busy enjoying the tunes rather than enjoying my system, or critiquing my system, if you will.