There are a lot of factors that affect image quality other than the lens itself. Will you use a tripod, or handhold? How big will you want to enlarge your negatives? Generally, do you favor a wider angle or a narrower one? If you're also schlepping the MF system, what will you be using the 35mm for, and how crucial will some small difference in sharpness or contrast between one lens and another really be? If it were my decision, I'd expect to have a pretty well reasoned choice arise just by answering those questions.