I bought the G5 almost 10 days ago and I'm really satisfied so far.
I was worried about the battery duration (after reading several reviews) but after the first full charge it lasted 86h (with 4h SOT, some FullHD and 4K video), yesterday I charged it after 73h 49m (12% still available on the battery, over 4h SOT, 3h 30m of calls)...I'm not probably a so called "power user", I don't keep the data connection/wi-fi turned on the whole time, I switch them on only when I need and when I go to sleep I always set the airplane mode.
That's my "use profile" that I always followed with all the phones I had (Galaxy S2 and Zenfone 2 DeLuxe) but I've never reached the duration that I'm getting with the G5.
I think G5 it's been a good choice for me.
Regards,
Roberto