Having gone over the 3 proposals in more detail, I think I agree with officedweller that the S+H scheme is the most legible; though I think the way S+P had really a very interesting proposal vis-a-vis Philsopher's walk. Don't have a lot of good things to say about KPMB, other than the general Master Plan with the Faculty of Music and the nitty-gritty like the underground parking.
p5:
Indeed, I was pretty suprised by how the spiral staircase resembled Gehry's AGO. Interesting, it's a very "Toronto" thing to do - Diamond + Schmitt has one in Bahen Centre (and another at U of Guelph at Humber (?); KPMB has one at Field's Institute...
AoD