Contract between different factories and different times will make them either CIJ or MIJ.
My personal opinion is not to worry too much about whether its CIJ or MIJ the products made by the different factories in japan are of very high quality and standard.
As with MIM MIA MIK. As long as it feels good, sounds good, get it! But also make sure you can afford it, please don't steal, starve, beg, borrow or murder to acquire it.