the-negative: i find quite the opposite.  if i'm doing a full body shot with clothes, then it doesn't matter so much.  but even from a distance, if you can see the body and it's a uniform color instead of natural variation, all sss, fake or otherwise, will do is make it look like another type of plastic or maybe wax.  i've just spent several hours over 2 weeks tweaking lighting and skin shaders on a simple scene just to see if i can get a decent match to a bg photograph (it's kind of hard since there's nothing to cast shadows in the photo).  that is, i spend a lot of time on light and skin materials.  i'm not systematic or sensible about it, or i'd be better, but i work at it.  i still find that if a texture doesn't have variation on the face to show softer and smoother skin around the eyes with more pores showing on the forehead and nose, it tends to look fake. same goes for the neck (variability of sss), arms and elbows (variation in tanning, and elbow wrinkles), legs and knees (paler on the upper inner thigh, darker wrinkled knees), and especially feet and hands.  and that's the large details, not the miscellaneous variations in color, scars, freckles,  and other marks that everyone has on their body.   

i can paint all those in after the fact, but it's a lot better if i'm just using a texture that already has all that.

vektor - i assume from your post that you'd prefer to keep your lighting and shader as trade secrets, but as someone who has tried (if mostly ineffectively) i have to ask if about them.  did you use ibl?  i know that i haven't been able to get the softness your images show in poser (it's no problem in d|s with pwSurface), but the closest i've come is accidentally with ibl lighting. if it's ibl, is there any special source "image?"   second, are you using the fastscatter node?  if you are, have you changed it somehow?  i've never seen it behave that well. 

hoping you share some of your technique...