The difference in hue is massively problematic.
My lab team and I were recently working on a cure for an extremely serious virally transmitted illness. We're using an app that allows us to examine blood samples visually on the iPhone screen, with infected cells showing up as a different colour - the more intense the yellow, the more infected the sample/culture.
Obviously, when it came to incident analysis time, we couldn't determine the full scope of the infection, because the yellow tinge problem meant that any judgements we made were flawed. In the end, we almost had to abandon the project, which would have led to the death of thousands, many of which could have been prevented.
Finally though, we had a breakthrough - we realised that it was just a phone, and that the fact that it was 2-3% more yellow than any other phone meant absolutely nothing, since no-one should be doing any kind of work that would rely on a perfect display on a mobile phone. We decided that, at most, when we next watched a movie on it, it'd be mildly irritating at worst, and at best, it'd be entirely un-noticeable. Then we moved on with our lives, and never, ever made a thread about it on a forum.
The end.