It's a good question. There's probably a difference between a follow-him-around-the-park-even-into-the-dressing-room-at-half-time marker and a centre-half who excels in one-to-one battles but is otherwise happy to pass on and play a zonal marking game. Gentile is your best example of the former, Kohler I'd say although can do both is a great example of the latter.
I remember before the Euro 2000 final the Italian coach Dino Zoff was questioned on how he intended to deal with Zidane who had such a talismanic tournament and whether he intended to employ a man marker to quell his influence. But his view was that they were better off playing a zonal set-up in midfield to handle him. And in that situation he was right and Zidane had his quietest game of the tournament. A lot depends on the situation. With the rules and the threshold of contact favouring attackers now, it's also more difficult to employ a dedicated man-marker.
. Give me some time lads.