The G3 is basically the same as the 8030. I have the 8351B which are in the family of The Ones, any with 83x1 at the end. I also use two subwoofers. The main difference other than price ,the 83x1 series are 3 way and have the ability to use Genelec GLM to fine tune the speakers to the room. You’ll notice the difference in accuracy with the coaxial driver and waveguide when you hear the 8331 to the G3. I’m not sure how you’re consider using these but the smaller 8030,8331 are nearfield speakers for smaller rooms or close monitoring. The guide in the link shows the best distances for use.
https://www.genelec.com/correct-monitors
https://www.genelec.com/correct-monitors