Classic 50mm lenses are rather small, affordable and not very good wide open. The new Zeiss Milvus 1.4/50 is very big, very expensive and very good from f/1.4.
For this review I used the Milvus on my Sony a7.
All images in this review are processed from raw unless I mention otherwise. I did nothing fancy, just a little contrast and some sharpening.
Disclosure: This copy was loaned from Zeiss at no charge.
Sample Images