The good
emulations look EXACTLY like the original games, because they
actually run the original rom code. Fancy controllers and building kiosks
just make the illusion complete.
First of all, there is no such thing as a perfect emulation.
Secondly, even the CRTs differ. Might not matter if you've got bad eyesight,
though.
Human eyes at best are no great test to perfect emulation. Nostalgia for
the original can cloud your perceptions though, fortunately I live in an
area with dozens of huge arcades that include the old games in free
sections. I prefer a modern crt under emulation, to the old TV style
original displays.