Oh come on Krusty.
True, the g14 turns a a bit better. And? Both can get a 38/pony/jak/lala(lala is tough... depends mostly on the pilot), and neither of them can outturn a spit/ki/niki.
Its all about the style. For example, i feel more comfortable in a k-4 vs k-4 duel, with that heavy nose and massive torque i "think" i can control my reversal/tailslide/hammerhead better. Since in my style the ultra.low speed handling play a major role, i dont mind that 5-7% loss in the turn rate as much. Other people like to fight otherwise, so dont get deep conclusions about it. The k4 is the fastest, best climbing prop aircraft between 8 and 25k.
Uptown, i can say one thing: try them all, you will find which one fits the best for your style.
E-4: only for german dudes in leather. Rolls horribly, with medicore turn rate, very slow, poor climbrate, decent firepower but the worst balistics in game.
F-4: a spitfire-trap. Can do 333 on the deck, can climb fairly well, not awsome in sustained turn but can fly slow and turn in a small radius. Can outscissor any spitfire but the mk5. Handles fairly neutral in every situation.
G-2: a pimped up F-4. Climbs very good, does 343 on the deck and 405 at 21k, but loses a bit from the turn rate/radius. Also not as neutral as the F. I never take gondolas, DTs or the bomb. There are better aircrafts for that.
G-6: has 3 thing on the g2: some stability (only the experts will notice), better rear view (also worse over the nose) and a bit better firepower. In the other hand 5mph slower and climbs 200feet/min less than the G-2.
G-14: G-6 on steroids. 355 on the deck (only 311 without wep tho), climbs like crazy, but just like a G-6 above 18k. The loss in the turn rate isnt worse than the G-6s. They handle the same except the torque. Has the tater.
K-4: a rocket. Best climb rate in game, faster than anything else (365 otd), see the characteristics above. Ideal for drag someone away from the horde and finish him, but can hold its own in a many vs many too.
Generally speaking, 109s are light fighters, even the smallest extra weight you put on them will ruin their balance and performance. Bombs, DTs, rockets, gondolas all turn it into a pig. The DT/bomb rack costs you 7mph speed even after you dropped the ords. Even tho the load of ord options can be temptating, i only use the gondies, and only on dedicated bomber huting missions. But the single 30mm gun can get the job done too.
The F may be very good in 1v1 but epicly fails in the many vs many. You need 2-3 passes to finish your opponent what makes you very vulnerable to the pickers. That isnt any better in the g2/6 tho. Gondolas make you very slow and kill your turn/climb rate. The real improvement is the 30mm cannon, but it needs time to get used to. Also it works very well vs light GVs (lvt, m3/8/18, even the panzer4f can be smoked).
There isnt any "jolly joker" amongst the 109s, like the spit16, all of them have advantages and disadvantages.
Now its all on you. Good luck, have fun flying theese little killers <S>
