Huh? What blind tests? You can point to rigged tests for each vendor, but I can tell you it's just BS. I've built thousands upon thousands upon thousands of systems, with AMD, Intel, Cyrix, ATI, Nvidia, 3dfx, Rendition, S3, yadda yadda you name it.
Claims of 'smoother' are just evidence of bias or something broken when it comes to CPUs. Noticeable frame latency really only points to something being way out of spec (ie; trying to run BF4 on a Core-based Celeron or something idiotic like that), or something is plain broken.
One of the things I like to do, given that I usually have a half dozen systems up and running at any time burning in, etc, is have people try to guess what hardware is in the box. It might be a 4770K + R280X, it might be an FX6350 + 660ti, what have you. I've never had someone guess right on the money, and most people are way off.
If you pay attention here (or click on my name and look at posts, even though the last week). I recommend all the companies fairly equally depending on situation, I get crap from Intel fanboys when I recommend AMD, and vice versa. I have a zero tolerance for BS though, the facts are the facts and there's nothing you or I can do about it.
Fact : a properly working i7 2600k is in NO way less responsive or less smooth than a Phenom II, or any other AMD processor. And I would argue the reverse to be functionally true as well. If someone said 'This FX 8350 is not as 'smooth' as this i7 in Windows & Gaming', I would say : what settings, what GPU, you might not have as high a max FPS, but you certainly shouldn't have a lack of responsiveness by comparison, all other things being equal (ssd vs ssd, 8gb vs 8gb, Win7x64 fresh install v Win7x64 fresh install, same AV/background software, same GPU).
The fact is, claims of 'smoothness' are functionally bullcrap unless objectively provable. To put any subjectiveness on the topic at all invites the scores of fanboys and dishonest people to lie about it or rig tests. Hell, I can make a 4960x feel sluggish just by adjusting a few settings in bios if I feel like making an Athlon 3200+ feel 'smoother'.