Wow, thank you, you actually reminded me about one thing I encountered yesterday while checking the ways of saying these "medium, medium-well". Some resources give the endings ...分熟，and some 。。。成熟. Which one is more correct? Or are both okay?
Then there was a mess in variants, I couldn't figure out which one was "rare" and which one "medium rare", etc. Just googling wasn't of much help, but you really placed them all in order, thank you very much!!! :)
One more little question: this 熟 is pronounced as "shu" or "shou"?