I have the Rokinon 14mm canon 24mm 2.8 and an old zuiko 55mm 1.2
The Sony 18-105 is OK in HD.
The reason I want to replace the sony is the unreliable focus. Had some shots ruined with this lens (I can only describe them as focus dips.)
With a 100% manual lens this won't happen (or I can only blame myself).