I love your avatar . I find it interesting how some people "see" in terms of differing FL's. It seems though, that nearly every time I use the 50/1.4 (esp on FF) it just feels like an awkward FL and I end up grabbing for another lens. Otoh, the 35mm FL works for me, both on FF and 1.6x. Go figure .
Of course, the 16-35 and 70-200 are my only zooms, so I really don't have 50mm covered. I may have to buy another 50mm f/1.8 again, as I gave my old one to my (lovely) wife . But I doubt I will. Instead I'll probably just use my upcoming 35L on the 50D if I need to cover that AoV.