For some reason placebo effect doesn't work on me... Maybe a video sample could say more then those picture comparisons but, if you have to tell me where and how to look... that's like a mind suggestion trick aiming for placebo effect.

Looking at the comparisons from the linked site, the nVidia sample could be a little sharper, but the opinion of the ones that made those tests implies that both are cheating:

The two GeForce cards provide a much more homogeneous picture, although here too the standard drivers, including the trilinear optimization (in other words: trilinear filtering is largely turned off) is active.
...maybe one more then the other. So what's the conclusion?

The fact that ATi or nVidia don't lead a honest business... ?

DOH!!!!

You guys sleeping all this years? So obsessed with small details like this, that you're missing the big picture. Which is "They're both cheating, in one way or another..." It's impossible for companies like AMD and nVidia to work their way up and stay alive all this years by being honest.

Remember 3DFX Interactive?

In late 2000, not long after Voodoo 4's launch, several of 3dfx's creditors decided to initiate bankruptcy proceedings. 3dfx would have had virtually no chance of successfully contesting these proceedings, and instead opted to be bought by Nvidia, ceasing to exist as a company. The history of and participants in the 3dfx/Nvidia deal making can be read in the respective companies financial filings from that time period. The resolution and legality of those arrangements (with respect to the purchase, 3dfx's creditors and its bankruptcy proceedings) were still being worked through the courts as of February 2009[update], nearly 9 years after the sale.
Was just a reminder and let's not forget:

Graphics card makers subpoenaed in antitrust investigation

The US Department of Justice has delivered subpoenas to AMD and NVIDIA related to an investigation into possible antitrust violations in the graphics card industry. Details on the investigation are scant at this point, as the Department of Justice has yet to divulge any information in the case.

AMD said in a prepared statement that it was targeted as a result of its acquisition of ATI and that the DoJ has made no specific allegations against either ATI or AMD. The company "intends to cooperate with the investigation," according to its statement.

NVIDIA also confirmed that it, too, has been targeted as part of an investigation into potential antitrust violations related to GPUs and graphics cards. As is the case with AMD, the graphics card maker says that the DoJ has yet to make any specific allegations. NVIDIA says that it also intends to cooperate with the DoJ's investigation.

According to Jon Peddie Research, Intel was the top dog in the desktop graphics market during the second quarter of 2006 with 35 percent of the market. ATI (preacquisition) had 26 percent, while NVIDIA trailed with 24 percent of the market. Note that these figures include integrated graphics chipsets, which made up 62.5 percent of the market. When it comes to discrete video cards, especially those aimed at games and other high-performance applications, AMD/ATI and NVIDIA rule the market.
So who's playing who, THE CUSTOMERS, THAT's WHO!!

AMD/ATi and nVidia's PLAYING YOU!

Since ignorance is bliss, obviously...