Memnarchon :
Well no.
Iris pro is far ahead atm from 7660D. Intel did a great job in catching AMD on APUs and surpassing them. The GT2 or HD4600 you are looking to is just the mid range of Intel. Personally, I don't want them on K series (both on i5 and i7) cause as usual 99,9% of people buying such expensive unlocked CPUs, also buy an expensive GPU also.
lets compare apples to apples please.
a specialty $600 part with an expensive ram construction, and a completely unique one off igpu design vs a mainstream $120 part isn't quite the same thing.
That intel is a part without a market atm... and you'll only see it in something like a mac book pro. So yes... while the iris pro is a unique piece of hardware, its a piece of hardware almost completely designed for one purpose. Replacing the i7/650m combo in the macbook pro; it's $100 more expensive then the i7/650m combo in the macbook pro, and has down graded gpu performance, in exchange for better compute performance and longer battery life.