In X-Factor #25, Jean stopped the antenna on Empire State Building from falling to the ground. It was said to weigh several thousand tons. Compare that with people with superstrength. The strongest of them are in the 100 ton category, and they are considered insanely strong. Hulk can probably challenge Jean, but that is about it.
(It could be that the writer of X-Factor didn’t know how much thousands of tons really was. Like the writers of Supergirl who have no idea how much a ton really is. In one episode Supergirl was lifting an object weighing a million tons, but she gets constantly beaten up by people who are only moderately stronger than a normal human, so the writers don’t seem to realize just how strong Supergirl needs to be to be able to lift a million tons. But so far, no one has said that the antenna of Empire State Building doesn’t weigh thousands of tons, so at the moment it is still a major feat for Jean.)