Interesting article over at mflenses, 'who made the first floating element design' will get you there. Looks like the design was adopted in prime photographic lenses from fast wide early cine lenses, dating from the 1960s. Nikon made one in 1967. Canon's very fast FD 85s had it in the 1970s. CZ's first prime for photography came in the form of the 28/2 'Hollywood' prototyped around 1970.
Zeiss are notoriously very spare with lens commentary. Phillip Reeve's review of the Loxia 21mm and several other sources indicates it lacks FLE, others say it does have the system. The 25mm will likely be the same. I've not seen comments on the Loxia 85mm that it has FLE.
