This might not be perfect, but here are some links to information.

http://www.sportingcharts.com/nfl/stats/defensive-hurries/2014/
http://www.sportingcharts.com/nfl/stats/player-sacks-and-sack-yards/2014/

The sacks at this site add up to 28 sacks for GB, which concurs with Packers.com. I see hurries, but no stats for QB hits at sporting charts, and I believe that a hurry is not the same as a pressure. In other words, I do not believe that Sporting Charts measures pressures. Here is a list by individuals (# of defensive snaps per Football Outsiders, then hurries and then sacks per Sporting Charts.com):

Peppers: 623 9/5; CMIII 650, 6/4.5; Neal 485, 6/3.5; Daniels 515, 4/4; Perry 280 3/3; Datone Jones 212 4/1; Boyd 294 3/0; Guion 418 0/2.5 sacks. Burnett, Barrington, Hyde, and Clinton Dix each have 1 sack. Hawk has 0.5 sacks in 763 defensive snaps.

http://www.footballoutsiders.com/stats/snapcounts

These are raw statistics. My own interpretation is that Peppers and Neal are having better years than I thought. One has to be careful about simply extrapolating Datone's statistics. He has on 212 snaps, in part due to injury, but also because Boyd plays in running situations and Jones comes in for obvious passing situations, so it would be inappropriate (IMHO) to simply triple Jones' statistics and then compare him with CMIII or Peppers. My other thought is that Peppers is playing too many snaps (74.2% of defensive snaps).

Stats for Datone Jones, basically games missed and the number of times in two years his promotion of himself as the "answer" to the pass rush. Talk is cheap and so has been his level of play when he does get on the field, what Datone Jones have you been watching ? Perry has also had regular injury issues but when he has played he has been productive, he holds the point twice as good as the self praised Jones at much less weight. Remember the name Jerrell Worthy in next years training camp, you may hear Jones in the same vein if he doesn't start producing. He and Boykin's sudden inability to catch the football are the biggest disappointments of what may be a special season, we knew Hawk's decline was on the way.

I read recently that Neal and Perry both have the same run defense grade from PFF (I think it was -0.5 for each of them). By my own eyeball test, it looks to me like Perry does hold the edge better than Neal. PFF does have some anomalies sometimes, or maybe its some other reason, like missed tackles. In any event, Neal has been more active than I thought and bears a closer watch.

You're saying that until that players misses that 1 simple assignment which causes injury or is the deciding factor in a game.

MM puts so much into practice for the young guys. Not so much for the vets.