I love the La7, it's a real monster and good at almost everything.
The La7 is to the K4 what the La5 is to the g6/g14. Both are excellent aircraft but really, the La7 wins hands down for an all round dog fighter. Better guns, better power.
The biggest mistake people make in the la7 is not turn fighting with it. A high speed La7 is just an annoyance, a pest to be avoided and occasionally swatted when the chance arises. Once you realise that the lala can turn fight you become dangerous.