If they all live in the same neighborhood, using the same ISP and all have 15ms pings to the same server, they all have the same quality of connection. Bandwidth would not change the speed at which information was sent. It also depends on who's family is using the internet more. If the guy with the highest bandwidth package is (or his family is) downloading/upload torrents while playing the game, he may have the worst ping of any of them if it's happening while he plays the game.
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