Hi - can anyone advise if there is much of a sound quality increase when playing normal CDs from a 598 into a 568.2?

The reason for the question is that I have a 598 but am using it with a 568.1. When & if I get my 568 upgraded to .2 status will I see additional benefits in addition to upsampling all channels & DVD-A, ie specifically better CD quality?

Thanks

Paul