I know this is really hard to answer, so it's cool if you can't... but how much would it improve it, how much would it raise the detail and "life"?
If you can't think of a way to compare it, you could use kbps as a analogous comparison, eg. it's like the difference between 320kbps and 192 kbps, between 320 and 32 (lol), or whatever.
I guessing from a 192K or even 160K to a 256K or 320K.
A laptop is going to come with built in audio with the lowest costing audio hardware the manufacturer can get away with, that still does a decent job.
So adding an external DAC/amp usually makes a noticeable improvement.