The M8 is a fun camera despite some critisism, for its price now its worth a try. Nowadays we tend to buy not what we spent time trying but instead determine our liking based on internet satisfaction, while its helps in certain degree it also confiscate or delay your enjoyment.
For the magenta issue, I have been trying very hard, purposely shooting without uvir for a worthy magenta subject on the street, never had luck on this, i think i have better luck striking 4D then meeting a worthy magenta subject on the street.
Also i am still on the original firmware since i bought this camera then, dont even know what version is it, it's the version that can only take 2gd card, still i am enjoying the hell out of this camera. So my advise is, if you think it, buy it..