Not a chance. Had a G3 and was seriously unimpressed and the reviews I have read on the G4 don't seem to suggest that it would really be an upgrade from my Note 4
As you say in your 2nd post, the Note 4 has all the G4 has, but may I add that the Note 4 also has the unique SPen suite, faster Fast Charging, a better GPU and better build quality. You will also get much more for the Note 4 if you sell it later than if you sell the G4.
Sell the G4 now and treat yourself to a tablet or some other gadget and keep your Note beast