alt Hacker NewsI concur, also with no benchmarks to share, but I had the experience of rewriting a video editor timeline to use WebGL instead of the 2D canvas I started with and it got much faster. Like being able to draw 10k+ rectangles at 60fps became easy, where with 2D canvas it was stumbling.
I don't know any project which uses the 2D canvas. It's horribly inefficient except for the most trivial use-cases (basically demos). Any serious web graphics uses WebGL and shaders.