Is the Sony FE 85mm F1.4 GM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured mm f/ test image. Observe the contrast and resolution of these results.
Is the Sony FE 85mm F1.4 GM Lens set to mm f/ sharper than the Nikon 85mm f/1.4G AF-S Nikkor Lens set to 85mm f/1.4? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.