Originally posted by thechumpen My test shows that I have front focus which is what I was seeing in my pictures.
The only way to get front focus when focusing manually is if the focusing screen is not shimmed properly. Assuming you are focusing by eye and not using the green hex, which is part of the AF system. The green hex and AF system are useful but not extremely accurate with fast glass, as Adam noted there is too much 'slop' in the system. One thing that helps is start at a distance and move into focus, check the result. Then start close and move away into focus and check the result. Is one of those better than the other? If so, then you know how to focus with that lens. But a different lens might work the other way around. This gets you to use the 'edge' of the AF lock rather than the center. Sometimes it helps, sometimes not.
You should also check that your diopter is set correctly, if that is off then things will appear in focus on the screen but will not be in focus.
A new focusing screen will NOT automatically make focusing any more accurate, it will allow you to see more accurately when the lens is wide open. As noted above current focusing screens are not optimized for fast glass or manual focusing. You still need to be able focus by eye accurately. And the diopter has to be correct and the shims of the focus screen have to be correct.
The best test is to set up on a tripod, focus as best you can by eye then go into liveview and zoom in, check how you did by eye. If it is not right on then something needs adjusted.
I would check the diopter first, then try the start away/start close test and see where the green hex lights up.
And no test you do is useful unless the camera is on a tripod. At f/1.4 you are dealing with such a narrow depth of field that just breathing will change it.