What can one say about this lens... Yes, it is fully manual, but with the new cameras with focus peaking, it makes focusing affordable and I would dare to say easy. It is extremely sharp with incredible contrast from f2, the object isolation is unique with a buttery background blur. I have also worked with the equivalent Canon 135, but it surpasses it in all levels except for AF and weather sealing (which it does not have). It is the best optically 135 F2 that I have worked with. I recommend it blindly.
PS, perfect for astrophotography too!