Did E to F yesterday morning (JNB - MUC) and was actually very impressed. Took me 15 minutes once I stepped off the big bird (L arrival) to the lounge at 2F (I left from F21, not sure what part of F that is). Security and Immigration was a breeze, with people very friendly too.
Lounge at F was extremely crowded, not very pleasant.
I usually transfer to/from 2G (ZRH based) which is definitely much much worse...