Good for you.
1) You do realize that the end of WW2 and the end of the Korean War was less than 10 years?
2) "PVA troops in Korea continued to suffer severe logistical problems throughout the war. In late April Peng Dehuai sent his deputy, Hong Xuezhi, to brief Zhou Enlai in Beijing. What Chinese soldiers feared, Hong said, was not the enemy, but that they had nothing to eat, no bullets to shoot, and no trucks to transport them to the rear when they were wounded."
That is not the definition of a "professional" army.
And even if they were better organized by 1979 (each soldier had a rifle, and the soldiers were all carried by truck), they really were's much more than an antiquated mass of farmers that hadn't fought an external war since Korea.