No other vintage 28mm lens give me the results this Pentax gives me. Poppy images, with great saturation and contrast. Stopped down to f/8 near-perfect sharpness from corner to corner on a 42.6mp camera, and zero CA's. You can shoot straight into the sun with lens, and image still look great and contrasty. For some reason this lens does an exceptional job with blue skies or clouds against blue skies.