I am speaking out of experience. I am not a pro.
To date after using many dSLRs, my old S3 Pro gave me the least problem in terms of skin tone (other things aside). After looking at the pics from bros here taken using S5 Pro, I believe S5 Pro should be even better. In fact, I quite regretted selling my S3 Pro off. Now that this S5 Pro is going to be an endangered species, I have to dig $ from somewhere and get it.
I would say that what S5 Pro could produce is not something that everyone knows how to appreciate. How often do you really blow-out some areas in a picture and u must recover those? How important to u really are these blow-out sites? How important is the dynamic range to you actually?
To be frank, after shooting some wedding stuff, I admit, S3 Pro (i believe its the same, if not better for S5 Pro) really does wonders in terms of getting the slightly diff tones of white from the gown (for the black suit, i notice not so much, or is it just me). When i switch to use other brands even with their new processors (brand not mentioned), i PP until vomit blood also sometimes cannot get it right! I'll save the details. In short: the cameras I use now, just cannot match. There are many other things more important than pixels in a picture. The gradual tones, smoothness in the picture, film-like output, etc.
Some may say that its probably my skills that has problem. I admit, I am not very good. But in this situation, under the hands of the same person, using diff camera, can produce difference results. Clearly, Fujifilm camera must have something.
To me, S5 Pro is definitely a worthwhile buy. From the looks of it, u seem to know what u wanted in a camera. So I think u are the kind that will appreciate what it can produce. As for the newbies taking up this camera, seriously, think twice. With so many other camera in the market, see what u really want.