Completely false.
Displacement isn't the be all, end all deciding factor. Multi-cylinder engines are always more desirable in a performance application. For comparison sake, take two engines with the identical displacement. One with 6-cylinders and one with 8-cylinders. Even though the displacement is the same, the 8 cylinder engine promotes more cylinder surface area. This for starters not only aids in more even cylinder temperatures because of the smaller diameter pistons ability to more quickly dissipate heat, but also has the additional advantage of two more cylinders worth of intake and exhaust ports....thus increasing volumetric efficiency.
Couple this with the fact that because of the additional two cylinders, the V8 uses a shorter stroke, and that a powerstroke occurs every 90-degree's (unlike a V6 where a powerstroke only occurs every 120-degree's), you've got a more rev happy engine, with greater horsepower and RPM making potential.
The V6 in this case with its longer stroke will have greater low end torque potential, but will sign off much earlier in the power band than the V8 will.
Ever wonder why exotics are always utilizing small displacement V10 and V12 engines, yet pulling astronomical horsepower figures from them? Now you know! If it were just as easy to extract those kinds of power levels out of only a V6, don't you think they would have gone that route?
It's funny you mention Michael Schumacher. These Formula 1 drivers all drive small displacement V8 engines making beyond 700hp with 2.6L of displacement spinning upwards of 19,000RPM. Coincidence?
It’s commendable that Ford has been able to extract the kinds of power levels they have out of the latest V6 for certain….but let’s not go getting ahead of ourselves. All displacement being equal, the muliti cylinder engine will always produce more power.