Get Zeiss Milvus 25mm f/1.4 at B&H Photo.
Added to my review of the Zeiss Milvus 25mm f/1.4 is a Siemens Star MTF analysis at both f/1.4 and f/4.
This is a very good sample, and yet notice that symmetry at f/1.4 has deviation (top right corner). Many if not most lenses are far more variable.
At about $2399, I’ll just say this here: the Milvus 25/1.4 is a must-have lens.