The advantage of Hyper-Threading makes the Intel Core i7-3770K the most powerful processor of the Ivy Bridge series. With its larger cache and Hyper-Threading, it was able to win this comparison against its smaller brother. It also ran cooler than our i5-3570K, which seems to be due to a known issue with the TIM that Intel used for this series.
All in all, the i7-3770K is the king of Ivy Bridge processors. Its only negative point was the low-end iGPU used, which is probable to change with the new "Haswell" series.