In Spock he created a character, and the racial characteristic of all Vulcans, that hasn't been, and probably never will be, matched.
Mark Lenard who played Sarak, Spock's father, and Zachary Quinto, who played a young Spock in Star Trek Into Darkness, both came close. Quinto almost nailed it.
Tim Russ was embarrassingly bad as a Vulcan.
Most others played Vulcans as emotionless, but also played them without any personality whatsoever. Some were were so severe that they came across as almost 'angry' personalizations.