I've been in domestic and intl F and Y and never in C. I was on an old config 747 in F and the entire rear C cabin was empty so I poached one while I did my walk around the plane, and it took me about 5 minutes to figure out how that darn footrest worked. Those five minutes of frustration were enough to send me back to F, enjoying my electronic suite seat. I felt the old F suites were fine, I'll miss that desk! Can't wait to try out the new F, maybe next year or the year after. Now that china's all 777s, I'll just use Hong Kong as my entry point to China, and then hop over to Shenzhen to fly to Beijing on a separate ticket if I must.