Bringing back my question, I still debate upgrading my 50mm f.14, but now there is a Sigma 1.4 that may surprise...
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If it were me, I'd get a 70-200 or 17-40(16-35) just to be a little bit flexible before I get an 85. Anyway, you know what you need most.
If you're studying Szarkowski's The Photographer's Eye, you are already demonstrating more discernment than most.
The Nature of Photographs, by Stephen Shore, is almost a companion or sequel to Szarkowski. Two books by Robert Adams will inspire you: Beauty in Photography and Why People Photograph. Try Szarkowski's Looking at Photographs as well. Then, if you want to challenge yourself, pick up Susan Sontag's On Photography and Roland Barthe's Camera Lucida.
All of these books are short, but contain lifetimes of lessons. Each can be read over and over again and each time you will learn something new. And, not a single one talks about f-stops, ISO, noise, bokeh, crop factor, or any of the other drivel that bogs people down. They are all about vision and understanding this fascinating and addictive craft.
White Bull Terrier by MFV.pt, on Flickr
Nice shot, I see heavy vignetting though. Full Frame?