Intel Core i7-4770K Review
Energy efficiency is the key element of the new 4th Generation Intels, and it certainly performs well, especially under loading. With just the CPU the power draw is similar, but a 60W reduction with the whole system loaded is a big saving.
At stock there isn't much between them as they're both based on a 22nm process. However, 3°C could make all the difference with our overclocking.