[Dark Shikari]

You're encoding at such high bitrate that there's not going to be any visual difference between the two.

This means you've reached "saturation"; you're throwing more bits at it for no real gain.

IMO, this is totally pointless, and the goal should be a reasonable compression vs. quality tradeoff. And, of course, its hard to judge how good your comparison is without knowing your settings.

Also note that "Photoshop" comparisons are totally useless, even worse than PSNR or SSIM, simply because the eye does not see chroma with nearly as much accuracy as it sees luminance. All that matters is your eyes--and if you can't see a significant difference at screen's distance from a single frame, let alone in motion, your bitrate is too high.