Originally posted by GRUNHERZ
THe La9 had 4 23mm in the nose and was better than out La7 in every way. 
That thing would have been a monster.
The main difference between the 9 and the 7 is the wing profile and weight distribution (9 being "statically" more nose heavy)
They both have identical engines as does the La11 which was in production prior to the 9. (dont ask)
The La11 also had wing profiles like the 9 and (like the 9) an all metal frame and skin. La11 & La 9 curves however seem to be very similar to those of the La7 only showing real improvement at medium altitude.
What is obvious is that the combined fire power of 4 x 23mm cannon clustered around the nose is awsome.
As we know an La9 flies today and an article by Hanna (probably today the most experienced classic warbirds pilots in terms of hours and types flown) compares it to both the Fury and the Bearcat where by he states it to be superior in terms of air to air combat capability. Hanna has flown all three types.
Given this it would seem that the la7 would aquit its self very well against these types too.