So you mean the fabric part? I didn't get a CF feel from that, but I expect CF to be a finished material - not raw carbon fabric. I always felt the SA5000 was meant to look somewhat unique, and the SA3000 was meant to play off of the 010. Then again, if memory serves - the 010 is about 4 years newer than the entire MDR-SA line.
According to my notes the Qualia was introduced in April, 2004, and the MDR-SA5000 (and 3000, 1000) in December 2004. They were the third (or fourth, counting the R10) generation of biocellulose drivers.
SA5000 has rubber back, SA3000 probably the same embossed cardboard as the SA1000. Behind the drivers themselves are only a thin piece of black paper, dust cover.
SA3000 unboxing (and comparison with the SA3000):