"I think so, yeah. I would put [Ortiz] ahead of me," Yastrzemski told the Globe. "He had more power than I had."
While Yaz's 1967 year was a better year than any year Ortiz has had in his career, Ortiz had 4 excellent years (06, 07, 12, 13) that stack up well and has generally been an elite hitter for a longer period of time. I don't know that it's open and shut either way.
http://espn.go.com/boston/mlb/story/_/id/11271178/carl-yastrzemski-says-david-ortiz-boston-red-sox-second-best-hitter-ted-williams