Look here: The full Sony 50mm E-mount lens group image!

From top left til bottom right these are all native 50mm E-mount lenses (with one 55mm lens included):
Sony FE 50mm f/2.8 macro ([shopcountry 51065])
Sony FE 50mm f/1.8 ([shopcountry 49849])
Zeiss FE Loxia 50mm f/2.0 ([shopcountry 47047])
Zeiss FE 55mm f/1.8 ([shopcountry 37736])
Rokinon (Samyang) FE 50mm f/1.4 ([shopcountry 51066])
Sony APS-C 50mm f/1.8 ([shopcountry 51067])
Handevision Iberit APS-C manual focus 50mm f/2.4 ([shopcountry 51068])
Zeiss 50mm FE f/1.4 ([shopcountry 51069])
Rokinon (Samyang) APS-C manual focus 50mm f/1.2 ([shopcountry 51070])
Rokinon (Samyang) FE manual focus 50mm f/1.4 ([shopcountry 51071])
Zeiss Touit APS-C 50mm f/2.8 macro ([shopcountry 51072])
Mitakon FE manual focus 50mm f/0.95 ([shopcountry 51073])

I may have forgotten some other third-party lens (or rebranded version of the same lens). I think we can safely say we have enough 50mm lenses :) Althoug I could really like to get two more 50mm lenses:
Sony FE 50mm f/1.2 GM
Sony FE 50mm f/2.5 pancake

Here is the size comparison aligned horizontally (Click on it to enlarge)