Fuji needs to fix the Auto WB / color signature of the new sensor (X-Trans III) to match the WB of X-Trans II. The old sensor simply had superior skintones and worked much better for SOOC shooters in general. The color signature of the new sensor renders jpegs without the perfect skintones, crispness and beautiful tonality of X-Trans II.
Fix the erratic nature of the new exposure system. Too many times it underexposes by 1/3 to 2/3 stops, compared to the previous gen. cams.
