What gain does the Zero Edge have, is it 0.8 or 1.4 ?
Are you sure you're not seeing the shimmer from the screen, both versions have som sparkle, but the 1.4 more so. Sparkle is more noticable in bright areas. When the sparcle is subtle i guess i can almost look like grain. Ofc if might just be the RC on your Sony, that will make grain stand out, if there is a bit of grain in the movie the RC enhances this aswell as sharpening the image.