I have been using a 5dii with old takumar lenses and adapters. I have a 28mm, 55mm and 135mm. I also have canon's 40mm f2.8 pancake lens. I use the technicolor profile too. (I sharpen 60points in premiere) My issue seems to be around sharpness lately. Are ALL lenses soft at their lowest F stops? On my 28mm it's f3.5, the 55mm is f1.8 and the 135 has f3.5. What lenses have you found produce the sharpest videos?