I feel if someone has a S7 Edge the G6 wouldn't be a huge step forward.
Not having a last years phone, I would say the LG G6 is an all around solid phone over the S7 Edge and like the new 2:1 screen and like the flat screen and overall design of G6 over Edge and I think the phone will run better 821 over 820 and touchwiz.
But... the only two things I think the Edge will still have over G6 from all the posts is... battery life and camera.
I still think the G6 sounds like it has a good and interest camera setup with wide angle... but the S7 cameras were arguably top 3 cameras of 2017. I think G6 will have a good camera... but still better than last years top 3? (S7, iPhone, pixel)