Here's my Reel! Some RED footage and some DSLR

https://www.youtube.com/watch?v=jzNjD4I2vnY

The grid pattern is always there, You just see it more when depending on the light thats coming into the camera. It's a very well known issue with the camera, and so far there hasn't been any fixes for it by Blackmagic.

Thank you!

Thank you to everyone, This explained a whole lot and helped me greatly!

I guess I mean a full frame sensor, would full frame be considered or close to the size of 35 mm?

Very interesting points guys! Thank you!