I owned both about 1 year ago.
To me the Absolute sounded more round/organic than the Silver Ref II, and had a more solid and extended low end.
My macro dynamics in the end were stunning with AZ, I only don't remember if that started after buying the Absolutes or already was there with the Silvers.
The one thing in which there are a lot better cables in my opinion is the "air", between and around instruments, the way in which the recording space will be transferred to your listening room because you can hear the influence of the recroding space on the sounds. The " openness" This is were both the Silver and Absolute will fall short, if you are chasing that effect I would look elsewhere.
Also seperation in soundstage depth can be a little better.