Like Ian, I too always installed Nema 6-20's in my shop. I preferred them over the 6-15 as they will take both 15A and 20A plugs.
Make sure your circuit is sized for 20A though if you install 6-20 sockets. Otherwise what's the point?
I also put in a few of the L6-20 locking sockets, I really like those at the ends of my extension cords or anything that is important enough that I don't want to be removed or fall out.
As for the Chinese outlets, I don't think they would be UL approved, and so probably not a good idea to put them in, in case something happens. It would likely void your insurance.
However, that said, the Wikipedia entry states that the Chinese CPCS-CCC plug and socket is the same geometric layout as the Australian AS 3112, but only 1mm longer plugs. It should fit. You would need to wire the socket according to what the Chinese device expected to see.
Personally, I would not install that socket, but stick to UL approved sockets, and instead look for instruments with IEC plugs so you can change it out easily for a North American IEC to NEMA plug.