I had never flown the K4 outside of one sortie here and there until last tour when I started flying it to knock out some LW achievements.
Bottom line, it's an amazing aircraft. After a few sorties to see how the 30mm flies compared to 50 cals, the 30mm is quite amazing and I started easily landing 4+ kills per sortie.
Not worrying about score, I was flying this aircraft at a disadvantage almost the entire time--- upping from capped fields, engaging aircraft with 5-10K of alt above me... All you have to do is get someone to slow down to match your speed, force the overshoot and shoot 'em in the poopshoot, or run them down if you miss.
I still haven't mastered the k4 flip; however, scoring with this aircraft in the MA is definitely easy mode. Granted, 95% of the time I died, I was picked by that high P-51 or P-47 I didn't see. The other 5% I was consistently schooled by people like Latrobe that are just plain amazing in it.
Here are some numbers for a non-German iron ponyb dweeb actively flying a K4 for the first time:
In tour 158, I went 229/82 averaging 2.76 K/D+1 (was running at 200 convergence on the 30mm -- oops)
So far in tour 159, I am 59/17 averaging 3.27 K/D+1 (was able to increase my stats now that I've got the 30mm at 650 and can actually lead them
)
For those that haven't flown it... fly it straight for a week. The best gunnery tip for 30mm I can give you is: Where you think you should aim to score a hit, at least double your lead or even triple it, based off your target's speed. You won't be disappointed!
Almost forgot... I'd much rather be in a K4 than my bravo with someone on my six, as it provides a lot more options, defensively and offensively.