Jim,
Just read the link - decent study BUT I must say that I see a difference in:
1. Ever so slight of an "apparent" sharpness increase with the 16 bit over the 14 bit. Could be what the little bit extra of data provides in each colors ramp.
2. Again, to my eye I see a slight "glow" to the 16 bit file that the 14 does not. This is similar to what I would see on occasion back decades ago when I was working in the development of the Eikonic camera (which Kodak killed in hopes of stalling the digital photography transition.) - we finally attributed it to the ever so slight current changes coming out of the wall.
Jack