In my case it made difference , BUT i had to choose between 8MP version. Key difference was that G2 had sensor size 1/1.2 while new G2H is using cheaper 1/1.8 due to having an IR and to reduce price to be more afforable.
In my case price was not even an option of discussion i just wanted 8MP with 1/1.2 sensor size, and i almost got tricked by G2H. I have pretty strong street light at night always and i dont need IR. ColorVue works perfect on 1/1.2, and i doubt it would on 1/1.8.
Other than that differences are that your color mode will work when event is triggered and it will use IR if nothing happens.
Firmware based they are same nothing of a difference besides obvious.
Cheers.