Ok, so here it is. I haven't gotten around shooting at a brick wall yet. But I think I will throw in more tests. This is what I did
1) mounted on a tripod, 70mm, set to AV priority, @5.6, ISO 100, AWB. Center focus point selected. Shot in a living room at night.
2) shot normally (2 sec timer, mirror lockup enabled) @ 5.6 aperture
3) live view (2 sec timer, AF Live) @ 5.6 aperture
If I did this right, then OMG. The shots from AF Live, is way sharper then normal Phase detect AF. I am including the full shot and a 100% crop of the top part of the book.