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That's odd, because my experience with my old AE-1 with a split prism and a 50/1.8 shows that I can get much more accurate focus with the split prism than with a super-precision matte. Most film SLR bodies had split prism screens that permit focus at very fast apertures, certainly faster than f/2.8. If that weren't the case, people would have found it next to impossible to get sharp focus with fast primes on 35mm film.
As for the super-precision screens, I have one, and I still cannot achieve critical focus with it. You simply can't see the focus well enough at, say, f/1.2 or f/1.4; certainly not as well as Live View. As theSuede posted some time ago in another thread, the super-precision screens show more of the marginal rays faster than f/2.8, but actually not that much more.
Not for me. In my opinion live view is a valuable tool, but I find a precision focus screen works best for me when shooting, unless it is a stationary subject/tripod mounted type of situation. Live view is fantastic for getting the focus spot on, however holding the camera at arm's length does not work for me, and with practice my keeper rate has steadily grown shooting at wide apertures through the viewfinder. Shooting a fast boy certainly helps! As for split prism focus screens, I have used them, and they are great up to f/2.8, maybe even up to f/2, but when focusing at f/1.2, good luck... Plus you are again stuck with the center composition or focus & recompose.
Sorry for the side track on an excellent 50mm tryout thread!