Is the Canon EF-M 18-150mm f/3.5-6.3 IS STM Lens sharp? This page visually answers that question. Shown above are 100% crops from a lab-captured 50mm f/8.0 test image. Observe the contrast and resolution of these results.
Is the Canon EF-M 18-150mm f/3.5-6.3 IS STM Lens set to 50mm f/8.0 sharper than the Canon EF-M 15-45mm f/3.5-6.3 IS STM Lens set to 15mm f/3.5? The image quality comparison above also answers that question. Switch between the results to see the sharpness differences between these lenses.