I wouldn't bother with the 35- with a greenscreen you only have foreground so there's basically no depth of field to see. Instead you could easily composite with a defocused background image in post to create the illusion of shallow depth of field. The 'crisp HD look' that's something you could also easily fudge in post. By adding too much diffusion to your photography you risk making the image too soft and difficult to pull a good key. Better off shooting a nice, well lit clean image in production and adding the look in post.
Noah
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