Subscribed myself to this thread as well!! I swear, this dilemma has been haunting me for weeks lol I'm also coming from a Nexus 5 and truth be told I really despise its camera. Idk if its cam is similar with the M8 though, but wow everything else on the M8 that's not the camera seems very promising. As for the G3, it's the opposite lol I honestly just really want it for the camera! Form factor doesn't really matter for me between the two because both look good anyway.
If you're anything like me and use the camera everyday for a variety of reasons, I would suggest you go with the G3. I can only speak from playing with multiple units in stores but the M8 camera is just mediocre at best. Pictures were always blown out even with the smallest light, details were murky due to the 4mp camera, and it simply didn't give me a satisfying picture most of the time.
In my opinion, the M8 will take awesome shots if you take the time to set it up (get the right lighting, angles, take multiple shots from different perspectives, etc.). After using the G3, I just couldn't use the M8 after. Then again, the camera might not be so important to you as it is for me because I consider it a deal breaker!
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