But in this case, this is the context that works for X-Men. The franchise was on its way to the grave (almost) with those last two films that left a certain bad taste in peoples' mouths, so comes along Vaughn's work, therefore validating these comparisons.
Besides, it's not just comic book films, the Bond franchise has been mentioned as well. So I think this is very apt.
Moreover Vaughn has himself made comparisons between X-Men and Batman and Bond. That's about it really. Every other film mentioned are a different kind of beast.