Been riding 747s since childhood (that would be the 1970's) - including the pre-400s. I remember a trip on a CI 747SP that also had the side galley - very cool for a 9 y/o to walk around and enjoy that whole space without being told to get out!
A couple more 747-400 trips this year on BA.
I do need to figure out how to take a trip on a 747-8i, something I still haven't done as I don't usually fly LH, CA, or KE. Anyone else operate them?