Hmmm. Why are you comparing piano libraries from Cinesamples to Mural from Spitfire? Are you from Cinesamples?
First of all, I'm kind of questioning whether or not you know how to use the library. I have a lot of the "free" libraries from Spitfire, and even they are extremely useful and very organic and real sounding (especially the mini harp, scary strings, and soft piano). I do own EDNA and find the library immense and creative, and have gotten a lot of compliments on the sound when using the library in works. I cannot comment on any of their full orchestral libraries. The demos make my mouth water though. Now that you mention Cinesamples, I have paid quite a bit of money on their libraries, including their Percussion library Drums of War and Orchestrator tool CineOrch. I have not been that impressed, especially with their percussion stuff. Drums of War is way overpriced --there is hardly anything to it. Worth more like 20USD, not 100USD. CineOrch, similarly has barely anything to it, which makes its utilization limited --though it does sound decent. I don't know, from demos and personal experience I think I'm going to lean towards Spitfire and attribute your review with user error.