Can we agree that if there is a difference between CD quality done right and high resolution that the difference is very small, and hard or very hard to detect?
This is a tricky question because "very small" is subjective and the extent to which differences are audible vary depending on the content. I have a digital recorder that can do 24/96, and the difference between that and 16/44.1 can be noticeable. A lot depends on what you're recording.
The difference between vinyl and CD is bigger, much bigger than CD and high res.
I'm not sure I agree. I know it annoys some of my fellow analogphiles when I say that the very best LP playback and the best CD playback sound very, very close. But that can't happen without a lot of effort and expense on the LP side.
Every vinyl versus digital argument seems to devolve into an attempt to find some mysterious flaw with digital that cannot be supported with math, engineering, nor experiment.
I explained previously in this thread that the math behind digital audio - Fourier Transform and Shannon/Nyquist - is perfect and can be proven using math. Digital's flaws are elsewhere.
The differences between CD and vinyl are not small.
If we're talking high-end LP playback, the differences are much smaller than many believe. Many people are stunned when they hear first class LP playback for the first time.