What about the "special character or rendition" do you like? Remember that results on a computer screen of a scanned negative or transparency aren't representative of the lens...heck even a print may not give you a realistic idea. Scanning and electronic viewing both introduce their own artifacts to the image. An AI or AI-s 35mm 1.4 is 1/4 to 1/3 the price of the F mount Zeiss lens. Unless you're convinced of the magical Zeiss "glow"(of which I remain skeptical) it seems like that's a better option to me.