What module and lens are you using now and which module are considering moving to?
The smaller focus dot will likely translate to more potential detail… however, that may not equate necessarily to higher quality engraving for various reasons. This will depend mostly on your specific needs. What medium you engrave to will have a big effect on this. What types of things do you engrave and onto what medium?
Take a look at this Topic for a case where an upgrade can be counter-productive:
Note that going to a higher power laser could also reduce the effective resolution of power available to you. Let’s say for example that your current laser gives you a good gradient from 20% to 80% on the medium you’re engraving to. That translates to S values of 200-800 or a 600 value resolution. Let’s say this gets reduced to 10% to 40% (100-400 = 300 values). You’ve reduced by half the granularity of effective power that you can use resulting in less dynamic engravings.
So long story short… this could improve detail depending on your needs but is not without potential tradeoffs.