Are you looking at equivalent versions of each motherboard?
If you look at an Asus P8Z77V-LX vs an Asus Maximus IV Extreme then yeah there are differences.
But comparing similar boards side-by-side there is actually very little difference in features.
MSI GD55 and Asus Pro, Z68 (Gen3) vs Z77 comparison here
Please read through the thread thoroughly before responding.
Nobody wants to read a wall of text, formatting is your friend.
i5 3570k | 8GB G.Skill 1600MHz | R9 290 | SeaSonic 750X