I've been shooting with my 5dmkii for 15+ years. If it could do 1080p 60fps for slow motion shots I wouldn't want to upgrade.
I've moved beyond the camera and need something better.
I'm thinking about getting a macro lens and use it for a dslr film scanner setup. It'll work fine in a static setup like that. But I need something that can shoot higher resolution video, better auto focus, cleaner iso and something MUCH lighter.