See, this is kinda what how i thought you'd answer and the problem with this is that you can't really base much on how much knuckles you see on TV.
I would say that the majority of players on tour play with something similar to what kelley wanted in "strong single action" and few to none play with "manzella neutral." Closest one would be Tiger.
The problem when looking on TV is that say you have a strong single action grip and play with more mid body hands, if you set up tha way the face is going to be closed at address and a lot of players don't like that much. So they will rotate their left forearm prematurely to get the face to point where they feel more visually comfortable and it will also make their grip seem much stronger than it is.
IMO i would say that majority play with a grip that is close to strong single action, followed by a group who are slight stronger than that, then followed a very small group playing very strong grips (ala trevino, couples, daly, azinger etc) and then followed by the smallest group of "manzella neutral" or weak compared to today's standards and only people i can think of who use that are tiger and corey.