how big is the difference between a matrix (not LUT) profile built using a sufficiently accurate shot of a measured target, with flatfield shot applied __vs__ a matrix profile that some people can build using the CFA transmission curves obtained with monochromator, etc (or when camera manufacturer like Kodak publish such curves)... I bet Iliah Borg did both ways for some cameras and compared, it is interesting to hear what was the outcome... how noticeable were the gains, etc