Originally posted by mrjamesabels I am using my eyes. I use the beep as a guide. I know because the beep is a little off. Thanks
The screens in these cameras are not really well designed for manual focus, and the viewfinders themselves are actually not very good either.
I suspect you are having an easier time with liveview simply because the screen you are looking at is bigger and shows minute differences in focus better in your situation.
A lot of people who are using manual focus lenses are installing aftermarket screens that have focusing aids to assist with accurate focus.
To adjust your diopter correctly, remove the lens and look through the viewfinder. The diopter is correct when the etched lines on the screen are sharpest.
I am sure you have taken into account the very shallow depth of field at f/1.4 and have eliminated the possibility that what you are perceiving as out of focus is not just shallow depth of field.