Jaroussky as that ultimate bad-boy Nero in Handel's opera Agrippina. This sounds a lot more convincing as an approximation of the discription of the baroque castrati's singing than the old counter-tenors of fifty years ago. If you think the costume and wig are a bit over the top, it is opera.
If you want a sort of battle of the male sopranos, here's another of today's biggest stars, Max Emanuel Cencic.
And here's Jennifer Rivera singing it as a pants role
Update: OK, here is the late Alfred Deller singing Handel in 1953. He was a great singer and artist, you have to grant him that, but he was no coloratura singer, a good part of that could have been the lack of training - he was pretty much a pioneer in counter-tenor singing. It's impressive, considering his training in the English choral tradition, that he managed to learn how to pronounce words clearly, especially at that pitch range.
Update 2: The stupidity of the Brain Trust on this topic is predictable. The value of the life of no-mind. But they'll tell you how smart they are. Since there is no evidence to that effect.