This is basically a list of voice actors and what roles they play in anime. The author has carefully picked the interesting ones (in the second comparison) so that you will be surprised (ie plays unsuspected roles).
Anyway just look at it. (part 1 of comparison NSFW NSFW NSFW!!) and here (part 2 of comparison NSFW NSFW)
I apologise for this post's incoherence, it is fairly late (2:15) and my eyes hurt.