I don't know that it ever catches up either, but then again not all today's big guns have been as popular in the past as they now are, so who knows?
But I do think TTA 27's place is cemented in the Marvel keys pantheon. It's the first Hank Pym, and he's kind of the Martian Manhunter of the Marvel Universe -- a strong supporting character through all his various incarnations (Ant-Man, Giant-Man, Goliath, Yellowjacket, Dr. Pym) and a character whose story resulted in other key figures -- the Wasp, Ultron, the Vision, Bill Foster; I'm probably forgetting some.
So I think both 27 and 35 have their place as keys, the 1st Hank Pym in 27 and the birth (sort of, halfway -- you have to read it) of his first hero identity in 35. But the Pym thread woven through Marvel history is long and strong enough that 27 deserves its place; its not a situation of a "prototype" and then a full-blown superhero in 35; the 2 are halves of an evolving piece; very cool to read back to back.