There is no SO at lufthansa, every cadet starts out as a normal FO on either the airbus A320 family, 737 classic or as new entry type on the embraer 190 series (flying for lufthansa cityline then). After around 4 to 6 years one is eligible to change onto a longrange type or change company to lufthansa cargo (MD11). After a few years they will have the chance to become a senior FO with cruise captain qualification and finally they will at some point upgrade to the left seat on a shortrange type (currently A320, 737, Embraer) where they will be blocked for around 6 years before they can change back onto longrange. That way cadets will earn real hours and landings on the shorthaul fleet which means a large number of sectors in a short time (especially flying for german wings).
Other airlines do use SOs, however those hours are virtually useless as no actual aircraft handling is done, especially no landings and take offs, it is just a rather extended route experience program.