I remember years ago seeing a prerelease version of one of the wolverine movies. As the CGI models were still grayscale, it was cool to see at what points the fights were actors and what points it was CGI.
That was X-Men Origins: Wolverine. I was also thinking about that when I heard about this leak. This was the infamous Deadpool scene from it without the finished special effects, it's actually pretty interesting to see it this way.
- https://www.youtube.com/watch?v=2R5ffysgVvA