I need to round out lens collection . I shoot almost everything and have a decent set of zooms and primes (some L glass) that take me from 24mm on the full frame to 672 on the APS-C. I would like to have a reasonably fast wide angle prime in the bag Autofocus is not necessary but I am also curious about experiences with manual focus wide angle. To stay on budget this will likely be my first non- Canon lens. Are any of the lower cost options worth pursuing?