as a schemer, I tried reading both Maclisp and Interlisp, and my experience is that I find Maclisp fairly understandable (and relatively close in spirit to Scheme), whereas I couldn't understand almost anything from Interlisp, and their spirits felt far apart.
In the incidental interview I made a year ago with Bernard Greenberg (who wrote Multics Emacs in Maclisp, after all), he called Scheme "Sussman and Steele’s much-improved Lisp"
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