Our lead developer at Arroyo Labs has put together a couple of posts to introduce developers to Angular 2 by comparing it to Angular 1.
https://www.arroyolabs.com/2016/02/understanding-angularjs-2-vs-angularjs-1-part-1/
https://www.arroyolabs.com/2016/03/understanding-angularjs-2-vs-angularjs-1-part-2/