I honestly can't believe people watch Friends. The show is just so crappy, it's a comedy, but the comedy is lame. I don't know how the show became successful , but I'm sure a lot of it has to do with the theme song as the show itself is so uninspired.
I know that some people think Seinfeld is not funny or they just plain dislike the program - and I'd state my life that most of these people think Friends is creme of the crop.
The only other comedy that is of similar style to Seinfeld is Murphy Brown - although I only realized that sometime this year. That guy that played a main character in "Street Hawk" is basically George, in terms of acting style, and I think Jim is like Elaine, Corky is Kramer - but I'm not sure who Jerry would be, Murphy perhaps (long time since I last watched the program in re-runs).
The only other comedy that is as awesome as Seinfeld is Married With Children, just watch the re-runs from the first show on. Married With Children (in early series) is just drop-dead funny, moreso than Seinfeld, but the style of comedy in Seinfeld and it's characters and especially the acting give it a cult status greater than Al Bundy's.
Back to the subject of this message, comparing Friends to Seinfeld is like comparing David Letterman (Late Show) to an Oprah celebrity special - both interview celebs but only one is truly funny.
I actually think Friends was crafted for an audience that does not know anybody funny in real life because the comedic elements are those that tend to spring up in everyday life. For example in Seinfeld where George is trying to get fired by driving around the Yankee Stadium carpark dragging the trophy would not be funny in reality but in the context of the episode it's hilarious. Friend's is the complete opposite, not funny in the context of the show or episode and yet would be funny in reality.