Just seen its only about 3mm wider than the G4 and thinner too (at the thickest part that is). Looks to be Galaxy Note 4 size which I had for a few months and struggled with. The G4 dimensions hit the sweet spot in my opinion.
Liking the addition of the fingerprint sensor, the fact that it's metal and the second screen, but a little concerned about the weight, size and battery life.
Still loving my G4, plenty big enough, if it had a metal frame, fingerprint reader and better battery it would be perfect!