Is there one Screenplay that is an example of being perfectly written by the majority of screenwriters that they keep at the ready to refer to while writing their own works? I was hoping to learn of one example of words either written or an image to keep on my desktop.
Yes, there are many. You can find them quoted in scriptwriting textbooks.
For instance, Linda Seger in her famous book Making a good script great cites The witness by E. Wallace and W. Kelley as a paradigm of a good script.
Every book about scriptwriting contains many examples of "good scripts". There may not be a universal consensus, but those examples are what the teaching of the art is based.