*spoilers*
I agree that Call/ Tommy Lee Jones's performance during Gus's deathbed scene is outstanding, and Duvall's is all the way through. I think that, in the mini-series in particular, Call becomes much more sympathetic (or at least I feel increasingly sorry for him) around the time of Gus's death and after.
Prior to Gus's death, I enjoyed Call for the banter and bickering with Gus, which I always founds charming and funny at points. But, in the early stages of the story I don't particularly feel much for Call as a character on his own. But, with Gus's death, I guess inevitably, Call's own character comes into better focus... and his emotional struggles/ emotional repressions become more and more poignant. With Gus's death, Call's devotion to Gus becomes very clear, and, it's of course, very touching too.
I agree also about the idea that I was sad with LD (the book) ended. I'm excited to read the two books that, in terms of narrative chronology, come before LD. Because, I'm very curious about the partnership between Gus and Call in their younger days.