It is my understanding that the LGB versions have been released but I have not seen any. It is also my understanding that these coaches are not replicas of the Bernina panorama wagons but are, in fact, repaints of the FO/BVZ coaches shown below in GEX livery:
I don't think that the Kiss panorama coaches have been released yet but when they are released they will be replicas of the Bernina Line panorama cars which look like:
The coaches above were produced by a small German outfit called Schwebe. The biggist visinle between the two types of panorama cars is that the Bernina panorama cars have a more rounded roof profile than the older FO/BVZ coaches.
If you are looking for accurate models think your choice should be the Kiss versions.....