Hm... but the AI will tech so fast that the Hoplite wont even last much... Right?
Well you have many responses, but here is mine. The AI will not tech fast at emperor, only faster than it would at Monarch. You should be able to stay right with them on self research under most conditions.
One of the things that makes it seem like they are running away early in tech is huts and trading. In a pangaea or a continents game you would expect them to get the AA techs fairly fast.
They will have contact at a decent stage and trade techs, so you could well be behind near the end of the AA or the start of Middle Ages.
This may even be a number of techs, if you are not able to trade some as well. It is just a temporary condition, IF you play fairly well.
You can play in any number of fashions, the two most often seen is builder and warmonger. You could play some variation of those, just so long as you are managing things well.
Frankly I was in love with Riders when C3 came out and played them out to deity just fine. PTW made a few changes, but still China was very strong.
I used China a number of times in C3C, but since there were so many new civs, I have not used them a lot in recent times. I think China and Persia were used so much that many just decided they were stale. That does not make them weak.
None of the civs will be good enough at Emperor, if you insist on misusing workers and building too many structures too soon.