The only tank that really gives me any issue is the Tiger. You have to have a pretty flat angle against it to do the job, but oh boy, will it do the job nicely when you do.
Of course, I've only tested this offline. Haven't been lucky enough to run into one yet. In offline testing, I find that the King Tiger is even easier to knock out than the Tiger. In both cases, I attacked their flanks. It took me 2 taps of the fire key to knock out the turret on a KT, coming in at a shallow angle. 3 passes total as on my second pass I hit the other side of the turret. On the Tiger it took me 2 passes, one on each side. The 1st pass I only landed one (between hull and turret), the other's ricocheted. I came in with a little less angle against it than I did with the KT, but still fairly high. On my 2nd pass, I was literally just feet from the ground, landed a nice shot between the top of the tracks and the skirt-ish bit. Turret went flying. All these shots that I made were around 500-400, which is about where I have my convergence set on my guns. I usually only take 2 shots before breaking off for my next run.
Reason I find it easier to knock out the KT is because I don't have to have such a flat angle against it as I do with the Tiger. Means more room for correction and evasion.
For the T-34's I just use the same spots on it that I did before when I used the 2D. From behind and into the spot behind the turret. If you come in at a angle to their sides, it'll knock them out real fast. Just gotta watch out for their guns as you will be WELL within their gun elevation limit.
For me, the G-2 is now my Primary tank killer, which use to be the 2D. The only thing that keeps throwing me off is that when I flew the 2D, I'd tap the "B" key for my shots. Sometimes, I do that in the G-2....doesn't work out too well.