When comparing the capabilities of two different aircraft, one has to strive for objectivity. That means, when evaluating both quantifyable as well as less quantifyable performance, you have to leave out differences in pilot skill. You basically have to assume both pilots having the same skill level (which means assuming both are decent sticks capable of reaching the respective performance limits). Determining absolute performance under controlled conditions has absolute preference to subjective/anecdotal experience in MA (which still has some worth under certain circumstances)
Now to quote again:
Any decent 205 driver will dictate the fight against a 109F.
"Dictate" is a very strong word in air combat. It means that one plane has such a huge advantage in a critical area of performance, so that the other fighter has no chance but to fight on his superior enemy's terms. Usually that's speed & acceleration, because the faster plane can choose to engage & disengage, the better turner can not, unless he has a initial positional advantage.
Now let's take a look at the 205 vs 109F



Not on these charts: Dive performance (clear advantage: C.205), Rate of roll (C.205 wins by a slight margin)
As you can see, both planes have the about the same speed and acceleration and are very close in rate of climb (C205 having a slight edge up to ~6000ft, the 109F a bigger one above that altitude. Both turn rate as well as turn radius the 109F clearly outclasses the 205 (with and without flaps).
The 205 has the better roll rate, but not to such an extend that it could use it to "dictate" the fight. It has the far better weapon package, but that ain't dictating a fight either, it's just a big bonus when someone has managed (by using his plane's performance) to get a gun solution. The 205 is also better in a dive, but when a c205 noses down to get to speed the 109 driver can decide whether to or not to follow. It actually is a big advantage when the 205 started out with a positional advantage and is able to dive on a lower 109F.
There is only one area where one of the two planes has a very big, distinctive advantage, and that's in flat turn performance. And it's not the C205...