A trigger job can make the pull smoother and any competent gunsmith can help you there. If the handgun is new cycling the trigger will wear the parts in and make the pull smoother.
Get the shims and new springs. I've done it on 2 of my Rugers (one a Redhawk), you can also do a little polishing (youtube that) and it will smooth it up. This is probably what a GS will do if you take it to him
Shims and springs will help a lot but no gun with a coil mainspring will ever feel as smooth as the leaf spring S&W design.
J frame S&W use coils and feel junky next to a K/L/N.
My GP100 is pretty much as good as you can get a Ruger DA; have done 3 SRH models but rarely shoot those DA.
Redhawk is a bit different inside but you will see a difference after shims and springs.