I agree with you, HRE. The only reason I mentioned Greg Meyer is that someone on the first page of this discussion suggested that Meyer might somehow be a close second behind Dixon for versatility. So I thought I would mention the similarities of Meyer's PRs with those of Geoff Smith.
As for Dixon, with his 1500 meter bronze from 1972 and his NY win from 1983, and with all those great performances over the years in between, he is truly in a class by himself. People can point to Aouita, but he didn't last nearly as long as Dixon at the world class level. Few runners did.
I might also point out that in Prefontaines's greatest ever international performance, Pre only managed a third place finish behind Dixon, who probably regarded that race as just another routine victory. It was in a two mile race in Stockholm on July 18, 1974, where Dixon ran 8:14, Puttemans ran 8:16, and Pre ran 8:18.
8:14.32 Rod Dixon NZL
8:16.55 Emiel Puttemans BEL
8:18.29 Steve Prefontaine USA
People who think Pre would have beaten Hildenbrand or Dixon in the Montreal 5,000 are pretty naive.