I would postulate Mr. Ford has tried the 57/08 and even some PRS pickups we don't know about.Wonder if Robben's tried the 57/08's that guitar?
The RF pickups in the signature McCarty are quite different to the 57/08's or the 58/15's I have in my other McCarty. Less output (similar to 58/15 LT or Seth Lover), more scoop in the mids, brighter and punchier. The attack and fundamental is alot like the narrowfields, IMO. I am sure the 57/08's would sound killer in the RF, but I love mine so much as is, I doubt I will ever try it out.