Polyglot - one common problem is when the overall scene lays comes out blue due to heavy overcast etc, or the dominant portion is in deep shade. This kind of problem needs to be corrected with warming filters at the time of the shot. It cannot always be post-correct (despite the constant progaganda of PS addicts). With mixed lighting, one has to make an esthetic choice of whether to correct or not. But yeah, Ektar is actually more accurate in the shadows than Portra. But folks accustomed to things being artifically warmed for the sake of pleasing skintones
might be find blue shadows at bit unnerving. People were pretty pissed off at Manet and Monet seeing blue in the shadows too.