Is the Sony FE 70-200mm F4 G OSS Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 100mm f/4.5 test image. Observe the contrast and resolution of these results.
Is the Sony FE 70-200mm F4 G OSS Lens set to 100mm f/4.5 sharper than the Tamron 70-180mm f/2.8 Di III VXD Lens set to 180mm f/3.2? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.