the iPad Air comes with a 12w charger which is provides more power than the one included with iPad 3 (10w). The battery capacity of iPad Air is quite a bit smaller as compared to iPad 3 too, so it probably charges faster than the iPad 3. I never really noticed the difference as I've always left my iPad 3 and Air to charge at the back when it requires charging..
The iPad Air will most definitely still takes a longer time to charge as compared to the iPhone