You appear not to have bothered to read about the new battery results
http://bgr.com/2014/06/09/lg-g...
Screen contrast is down, indeed, though it went from the brightest smart phone to merely middle of the pack, which is a shame.
http://www.gsmarena.com/lg_g3-...
I'll admit I never really worry about black levels on a phone as long as they are dark-enough, though, since I never use it for critical cinematic viewing and suspect most of the population is with me on that. The loss of max brightness is, imho, the biggest downgrade, though the minimum brightness is lower, which is nice for night-time viewing.
Can't argue about too many pixels, though as long as it doesn't kill the battery life I'm okay with it. It could be 8k if it didn't slow the phone down or deplete the battery - who cares?
Hard to believe that a faster CPU and faster GPU is a "downgrade", but I guess if "faster" means "slower" to you...
It is bigger, though less so than the increase in screen size would suggest. Size is a personal thing for a phone. At least with the G3 you can carry a spare battery (or two) if you need exceptional endurance and can't stand external batteries.