Well, the guns are probably wider than spitfire cannons, zero cannons, hurricane cannons. Not quite as far out as P47 guns, but about average with most 50cal armed planes. Oh, and the La7 will out turn it almost every day of the week.
It's not a great turn fighter. It's "okay" but where it really shows potential is the overall good qualities combined (so make a high turn and come back down to conserve E, or vertical yoyos, or high speed turns that bleed E, and using horsepower to regain the E, etc).
As for intercepting bombers, it can, but it's hit or miss. Not literally, but sometimes I've unloaded my entire ammo load into a box of B-24s with nothing to show for it, and sometimes I get lucky and land 10 bomber kills in one. Overall it's vulnerable to the super-WEP way bombers work in AH, and it can be shot to pieces easily by tail gunners. Seems that the 20mm are weaker than the 190's guns, but it may just be a false perception.