When Kylo Ren says to his father: [Han Solo. I’ve been waiting for this day for a long time] some of you might argue that this quote is clumsy fan service, because Vader said that to Obi-Wan.
Did Vader say that?
I think you mean “I’ve been waiting for you Obi-Wan, we meet again at last.”
Similar but different enough. I wouldn’t consider it fan service though, maybe an echo or a soft reference to the earlier duel.
This is actually the first time I’ve associated those two lines as having some kind of relationship to be honest.