>>3376917>https://mega.nz/#F!wMoBgKgB!k0o6QBLJNzNKHpU3lEINAAidk if anyone responded to you or not but here is my 2 cents:
I have owned a Panasonic G7 for two years now and have done a fair amount of research into the best vintage lenses that lend to that 'flat flare' sort of style that a lot of people are after- including myself.
Helios 44-2: This is a good lens but will give you swirly bokeh when you bring the aperture down around f/2. Maybe you like that look, I go the Fujian 35mm CCTV lens for the same thing.
Seems like you already have the 50mm range covered, though I would have recommended a cannon fd 50mm. But since you are going to have to deal with 2x cropping I would recommend you get a cannon FD 24mm f/2. It is a workhorse lens and its always great to have a lens that comes close to 50mm after cropping as it is mostly the standard work horse length and as I've read 'most accurately represents what the human eye sees' or whatever.
That Carl Zeiss is probably going to be a beauty, check out the Fujian CCTV 50mm, it looks like a chepo shit lens but its pretty good. Here is a still from some short I did a year ago with it.