At the end of the day, there's always more weight to be lifted. a 5 lb PR is a PR, no matter how you look at it. Even if it's 1 lb, that means you've gotten stronger. The road to being strong(er) is one that is filled with trial and tribulation and will never end. There is no pinnacle of strength. No one will ever find themselves strong enough. Like the other guy before me said, you will always be weak even though you're strong in the eyes of others.
So to answer your question, fuck no, I will never be satisfied.