I'm not sure about comparing to those languages but I did a post comparing other prototype based languages https://bluishcoder.co.nz/2009/07/16/prototype-based-program...

For me though it's not about the Self language but about the combination of the language and environment. I did a screencast attempting to show some of how Self development is done https://bluishcoder.co.nz/2015/11/18/demo-of-programming-in-...