Performance-wise, you'll feel a difference. Looks-wise, there's a difference. And when you go somewhere and meet other riders, there's a boost to your ego that can't be denied.
If you haven't already, take a good hard look at each bike, side by side. The CVO breakout is breathtaking. Chrome front end, chrome everywhere. It's just an elite hot rod.
Like ChopperPilot said, plus, a CVO comes with some things you can add to a standard, but those things come at a huge cost. But it also comes with some custom feature you'll not be able to get like matching floorboards and grips and paint for starters.
Does the '14 come with a warranty? Can you get an extended warranty? Can you talk him down in price a little? Do you know how it's been cared for and how it's been driven? Was it kept in a garage or outside? Does it come with all the factory original accessories a CVO comes with?
All important questions.