Full spec comparison between those four lenses can be seen on this BHphoto comparison page
Ted Forbes made a comparison between the new Sony 50mm f/1.4 GM and the Sony 50mm f/1.2 GM, Zeiss Otus 55mm f/1.4 and Leica Summilux 50mm f/1.4. Check out the video to see the results:
Sony 50mm F/1.4 GM at BHphoto. Amazon. Adorama. FotoKoch. FotoErhardt. Calumet DE. WexUK.