Just because it's got an R to R doesn't make it, by default, better.
If staying with the title of this thread "Absolute top tier DAC for standard res Redbook CD" I think it does.
As from all I've heard, a well implemented R2R Ladder Multibit Dac whether chip or discrete, run rings around Delta Sigma and all it's variants that are said to be "the best" implementation of it also.
R2R Ladder Multibit from what I've heard gives a jump factor, lower mid body and general excitement to the music. Delta Sigma while smooth is unexciting in comparison when doing RedBook.
Cheers George