A couple thoughts.
Did you use identical soil in all of the pots? Add any manure? Are those pots located near your fenceline? That vaguely resembles herbicide contamination, either from contaminated manure or drift, although I'd expect the leaves to be contorted as well.
Are the curly plants all the same variety? I grew Apricot Zebra last year, and it had a very similar form. I'd never seen a tomato grow like that, but it was perfectly healthy. Sorry, didn't keep photos of it.
