That's actually a pretty convincing list! You might want to consider adding a feature comparison matrix for a few of the more popular formats in a prominent location. It also probably wouldn't hurt to lead the page with a small example of encoded text, the way MessagePack does (it's what got me to give their website a closer look, which led to GitHub, and then I started using it).

Regarding the point about having a sister text format, I suppose I'd tend to view JSON as filling that role. Not to bother you for a second comparison, but if you happen to have it handy seeing how CTE compares to JSON in terms of encoding efficiency would be interesting to me.

Edit: I found a list of MessagePack <--> JSON limitations that I hadn't really thought about! (https://github.com/ludocode/msgpack-tools#differences-betwee...)