While I gave the "Most Beautiful Lens" title to the Zeiss Milvus 21mm f/2.8 Lens, the Zeiss Milvus 50mm f/1.4 Lens is not far behind it on my list. This lens feels at least as nice in hand as it looks in the pictures.
The Milvus update, including a new optical design, has been very good to Zeiss' 50mm f/1.4 in terms of image quality as well. Here is the new vs. old Zeiss 50mm f/1.4 comparison. While the Milvus 50 is not as crazy-good optically as the Zeiss Otus 55mm f/1.4 Lens, it costs far less. And it competes well in many of the other relevant comparisons:
Many more relevant comparisons exist. Build your own.