Originally, I thought that the distinction between socialism and capitalism should be considered comprehensively, but people can accept the traditional definition of difference to distinguish things. Therefore, the public ownership of the means of production (but not 100%) should be an easily distinguishable feature (just a feature).
Marx also pointed out in Das Kapital: "We have seen that the premise of this mode of production (referring to the capitalist mode of production) is that on the one hand, the direct producers are liberated from their simple attachment to the land (in the form of attachment to farmers, serfs and slaves), on the other hand, the people's land is deprived. In this sense, the monopoly of land ownership is the historical premise of the capitalist mode of production, and it has always been its foundation ... "(from the third volume of Das Kapital, p. 696). In other words, capitalist society is based on private ownership of land, both in theory and practice. But at present, rural land in China is collectively owned and a form of public ownership. When rural land leaves the countryside and enters other non-agricultural or non-agricultural industries, whether it is industrial land, residential land or public facilities land, the land is expropriated for state ownership and also belongs to public ownership. In other words, all the land in our country is publicly owned, and the land, one of the two major factors in the means of production, has been publicly owned. With the transformation from an agricultural society to an industrial country, the socialism we are building today has developed on the basis of public ownership of land. No matter how big the proportion of state-owned industrial economy is, it can't affect the foundation of public ownership of land, which lays the foundation that the social form we are building today is a socialist society with essential differences from capitalist society.