Is the Sony FE 70-300mm F4.5-5.6 G OSS 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 70-300mm F4.5-5.6 G OSS Lens set to mm f/ sharper than the Canon EF 70-300mm f/4-5.6 IS II USM Lens set to 100mm f/5.0? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.