There is lots of cross-language comparisons for dyslexia, and as someone mentioned, it is less common in languages that are more phonetically regular. If you have access to academic journals you can search and come up with a load of papers on dyslexia (probably hundreds of thousands!)
In theory, we could also change English to be more phonetically regular with regards to spelling to make it easier, but realistically that is never going to happen because everyone would have to learn how to read and write again