I think Spock of the classic series goes down first, but I think this is a close fight.

I think even classic Khan and Spock make it a good fight...but I still give Slade's healing the edge, and comic book characters with experience fighting more powerful characters the edge.

In general, I think Spock and even classic Khan are peers in strength to Slade and Cap...but the're not as fast, agile, or as good at fighting.

Transplanted, however, I think Khan would end up being very much like Slade as a villain....