Four divisions are more than enough. Actually there are no more divisions, the Chinese have switched to brigades, and they have 6 brigades in each GA. And their effective forces in Ladakh is equal to the full power of a GA, which is equivalent to our Strike Corps, but they are better equipped, with better access to air power.
Their army is far better equipped than ours. They are nearing the end of their modernisation, whereas we are only beginning ours. Emergency purchases is taking care of some of our needs, like new rifles and comm systems, but it's not nearly enough. Right now we are taking away systems from the Pak border and placing them in Ladakh, which isn't a good idea in the long run.