Do you mean the EG-S high precision screen? I wasn't aware you could get a split prism for the 5DII. That said, I have the EG-S on my 5DII and usually resort to focus peaking using the Magic Lantern firmware for my MF lenses since I don't find the EG-S helps me all that much.These were shot with a XE1 with focus peaking. It felt to me easier than focusing on the 5D2 with the split prism focusing screen.
If you say so, lol. I think you need to add "luck" or "not shooting subjects too closely" to that list also! ;-)I never had any problems with 1.4 lenses on my 5D2. Loved shooting with the Rokinon 35/85 combo. Shot weddings, kept up with my kids, etc. It is part eyesight, part practice.