Spock and Yoda would get along. Kirk would best a young Anakin--though not Pines Kirk--that might go the other way--a closer fight. Vader bests Shatner's Kirk still.
I want to see a kryptonian grab a light saber by the blade without damage--that would be a great scene.
ironically, if a Star Trek Star Wars cross-over had been done in the early 1980s, I could see a post STIII Kirk being a father figure to the younger Hamill, who would in his mind be rather like David.
Today, however, an expanded universe Skywalker (Hamill as he is now, older and wiser) could be a mentor for Pine's Kirk.