I would fly the other 109 models more if they had a 30mm.
As it stands now, the K4 is the best non-perk plane in the game. 
The K4 is my favorite plane but it's far from uber. It's a very hard plane to fly if you fly it to it's full potential, which is the main reason I like it. The thing flys like a brick compared to even the other 109's. The only clear advantage it has is the power the engine produces which makes it a pure killing machine down on the deck, if you know how to fly it.
Calling it uber has always irritated me, because that plane is a challenge to fly to it's limits. I don't think there is any other aircraft in the game that I have to work the throttle, flaps and rudder so much in a fight. While the plane is a out right killing machine in the right hands, it's far from uber in the hands of a average AH player. Which is the reason you don't see lots of K4's in the mix compared to other aircraft, even though a lot of kills are landed in K4's.
Typically when you come across a K4, you have a pretty high chance that they will be a reasonably good pilot. Reason I say that is because the K4 really has no other purpose in life but to kill things in the air, It doesn't carry bombs it just carries big slugs. You aren't going to run into noobs who are there to shoot radar's or kill ords, you will 9 times out of 10 be up aginst someone whom wants to fight. Typically people that are looking for easy kills don't fly K4's unless they know what they are doing which tends make it seem like the plane is uber.
As for the other 109's wih 20mm's like the G6.. Well I'll admit, I don't fly them because they only have 20mm's, so I'd love to see the G6 get a 30mm. I'll be honest and say I live on 1 shot kills hence the main reason I like the K4.
