Sorry what? This is the first time I've commented on iGPU vs dGPU stuff, and I've certainly never been presented with Anandtech stuff. Guess you're the ignorant one, just assumed I was someone else.
However, I'd like to take the time to remind you that this particular Iris GPU has not yet been benchmarked, and as such it's performance relative to a 650M is currently unknown. Next argument plz.
iris pro vs 650m benchmarked over a month ago:
http://www.anandtech.com/show/6993/intel-iris-pro-5200-graphics-review-core-i74950hq-tested
spoiler alert: Iris Pro loses by about 20% overall