My friend bought the 2014 edition a few months back and I noticed that it just falls short. Yes, it's good, but it's no where near as good as ours is.
First and foremost - the battery is stronger. He squeezes out a day of usage while I can go to school 3 days in a row without getting near a charger.
The note 10.1 surprisingly does not lag. I think that it's one of the only samsung devices out there that don't lag with Touchwiz. The 2014 edition lags even when you pull down the notification shade.
Even the 2014 main advantage - it's display - is not worth it. The quality on the original note is so damn good that resolutions don't matter. I gave a few people the chance to compare them. The majority pointed on my tablet, claiming it had the better screen. The sheer quality of the display definitely makes up for the not-so-high resolution.
These are just some few basic things. If you go in deeper you'll surely find other little causes to favour the one over the other. But looking on the big things - battery, UI and general feel and even the display of the Note 10.1 are superior to the new 2014 Edition. If you have a 2012 edition and are considering whether to upgrade or not - save your cash. The 2012 is simply the better one.