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If you want a prime, it's really all about FL. Tape your 17-35 to each FL and shoot them for awhile to see what you like. 35mm is my favorite FL on 35mm, but 28mm is generally what I reach for if I need a wide angle as I like to carry it paired with a 50/1.2AI-S
I have a 28/1.8G, but if I had known about the Sigma 35 last summer, I would have saved my money and looked long and hard at it too. It's such a great lens from what I've seen, and the price could easily be much higher.