Yes; hell of a lot better!
There's another post recently about a mini-system vs hifi separates. As i said in that; the separates will always be better than a mini system.
The Audiolab amp is a cracker and the Marantz CDP will sit well with it. The M/A BR2 speakers are superb and suit a wide range of music so i'm sure you'd be fine with them.
What would be handy for you is some decent speaker cable; a good interconnect and good speaker stands.
Not sure on your budget but the Soundstyle Z2 or the Atacam Nexus 5/6 speaker stands would be good (preferably loaded with atabites/dry kiln sand). The Chord Carnival Silverscreen OR QED Silver Anniversary speaker cable would be good as well as the Chord Crimson interconnect.
Hope this helps