Click to enlarge. SO close
I've settled for this conclusion: The RS35 delivers black level performance every bit as good as the RS25, and quite possibly a bit better. Theoretically it should be that bit better, but for a full out determination, I figure I'd need several of each, all at the same time. And that's not going to happen.
In determining the RS25 vs. my RS20, and again, doing the RS35 vs. my RS20, I put both of them up on the screen at the same time (one above the other, in my main theater), I was able to make out the slight difference in blacks. I was mostly able to do it by comparing the two letterbox areas. The difference is not great, but is a visible difference. It's just that without a "side by side" type of setup, you would be hard pressed to convince someone. Take my word for it though, it's there, it's real, and it takes the best black levels and makes them better still.