Got to chip in my 2 pennies here...
I am not a great 109 driver but I'm far far above average in the F4/G2. While the F4 is dominant to the spitV and the G2 to the spitIX we have anyone who thinks an F4 or G2 is dominant vs a Spit XVI hasn't ever run into a decent spixteen driver. The F4/G2 can certainly win the fight however it needs to be via a "midgame fork" that misdirects the spitty. Neither 109 can win an endgame vs the XVI. Thats just a statement of fact. Obviously pilot quality is a big factor here, most spit drivers are sadly deficient....
As for the A5, anyone who thinks that they beat a spit XVI on anything other then pilot error is delusional. Now again relative pilot skill is the big variable. I can beat about 50% (or more) of the spit/la-7 drivers in the game in a clean merge at 7k in an SBD...by contrast I'd say I can beat less then 25% of the 109/190 drivers. The reality is that those pilots have a better grasp of both ACM and plane limitations and fly a better fight.
This is valid. Im sure that a lot of pilot ability is factoring into these arguments - at least they are for mine.
All things being equal, yes the Spit 16 is a better A/C when compared to the F4, G2 and A5.
In the MA, though, I can count the number of 16's Ive run into, that were actually piloted by good virtual sticks, on one hand. The flat turn is usually what most end up doing, in which case the F4 has it beat. Vertical? Not so much. But then, the early 109 driver shouldnt be playing that game against a late war uber-ride, anyway.
The G2 is a bit better suited to fighting a "better" stick in a 16 and less suited to a n00b stick, oddly enough. Against a flat turn, the 16 will win. However, with an alternating climb/dive turn and tail-heavy trim against the 16, I find that the G2 can pull guns consistently. Even the G6 can get close due to the softer stall.
The 190A5 is an entirely different game. I am very confident going after Spitfires in mine - especially the 8's with the reduced roll rate, but again, because most MA Spit drivers think "On" and "Off" are the only two throttle settings, a decent A5 driver can hack it with them quite nicely.
But again, as above, I don't think anyone disputes that, pilots being equal, we'd all rather be in the 16 since it, frankly speaking, outclasses the early 109's and 190's in almost every way and, with the chopped wings, even closes the 190's roll rate gap.