Image quality test results have been added to the Sony FE 55mm f/1.8 ZA Lens page.
This is a very nice lens. Here are some comparisons:
Sony FE 55mm f/1.8 ZA Lens compared to the Sony FE 50mm f/1.8 Lens
Sony FE 55mm f/1.8 ZA Lens compared to the Canon EF 50mm f/1.8 STM Lens
Sony FE 55mm f/1.8 ZA Lens compared to the Tamron 45mm f/1.8 Di VC USD Lens
Sony FE 55mm f/1.8 ZA Lens compared to the Zeiss Milvus 50mm f/2M Lens
The Sony FE 55mm f/1.8 ZA Lens is in stock at B&H | Amazon | Adorama | WEX.