Top 10 Camera Phones ever tested by DxOMark with overall score:
82 iPhone 6 and iPhone 6 plus
79 Galaxy S5, Sony Z3 and Z2
78 Nexus 6
77 Nokia 808 Pureview
76 Sony Z1
76 iPhone 5s
75 Galaxy S4
Nexus 6 enters DxOMark Top 10 for camera performance - GSMArena.com news
I bet a software upgrade or two to fix low light performance(Sony Sensor used is very capable) and tweak OIS and adjust slight pink white balance in overcast/cloudy conditions might even push the Nexus 6 into Number One!
Yes, Google/Motorola pulled out all stops and did not hold back on the Nexus 6. Finally a no-compromise pure Android Flagship!
Personally, I would have been thrilled with average camera performance because it is not even close to being a deciding factor for me but I am very excited to unexpectantly get a great camera phone as well...