Dune shared the 1965 Hugo for Best Novel with Roger Zelazny's This Immortal...which says something about how good Zelazny's work is despite its relative obscurity (compared with Dune).
To be honest I found CoLaD too much "experimentalist" for my taste (I read both when I was much younger, so it probably went over my head, while LoL I reread and enjoyed through subsequently rereadings).