@tshark "Go Stars!"
Excellent question and I encourage you to run some experiments to given your current gear does have some optionality.
If you are currently using your McIntosh's DAC for CDs try the Luxman and find out what differences you hear if any.
If you hear a difference, what do you prefer? I think this is important - different gear can sound different and beauty is in the eye (or in this case ear) of the beholder.
There are pros and cons on using built in DACs within Integrated Receives, CD players and even Streaming/DACs. I recommend the trying different configuration of your equipment so you may determine if an upgrade is worth the price.