Hey guys loving my 5N and now strongly considering either 7 or 6. I read today something about a magenta color cast when shooting fast primes wide open (basically exactly what I've bought into NEX for, lol). How real is this issue ?? Any reason it happens on the 7 and not on the 5N ? Will the 6 suffer the same ? Sorry, I'm really clueless about this issue and trying to understand it. Thanks !