With the same specs, you get the same benchmarks on cMBP and rMBP.
The only significant difference is high-resolution screen.
This fancy screen looks good, but for some situations it is worse than a classic resolution screen
(for video games, retina sucks, because the same GPU needs to calculate and draw much more pixels,
and FPS is lower as result)
Another with selective memory loss:
This due to people not fully understanding what is on offer with the Retina MBP as a whole; The Retina is faster, has far more efficient cooling, better audio, better connectivity, quieter, lighter, thiner, and likely to be more reliable. Then we have the IPS display on top of this, that brings superior colour reproduction, contrast, viewing angles, reduced reflection, user defined scaling need more workspace you can have it, and of course resolution.
irrespective if you own a Retina or don't, these facts don't change; a Retina is highly likely to outperform it`s similarly specified standard counterpart as it`s thermal management is just so much better, where the standard system will bog down and choke due to throttling the Retina does not from my own experience my own Retina will run indefinitely at full load, at maximum CPU/GPU frequency.
These posts are simply tiring, loaded with negative comment by those that either only have about ten minutes experience of a Retina at Best Buy, don't have the $$$ and are just pissed off, have no clue about the engineering involved, bought a Mac at the wrong time and unhappy with their decision. Anyone actually using a Retina in direct comparison to a comparable standard model will know the difference.
For some the Retina wont work, and in general this is tied to software, equally this does not make the Retina the lesser machine. Once software catches up no doubt many more will make the switch. FWIW i have three 15" MBP`s two are quad cores with comparable processors, the Retina simply outperform`s the the standard system; same media, same environment, by a significant margin, the difference; sustained performance not a 60 second benchmark...