Caio,
while I can't weigh in on the technical discussion being offered by Tako and Lloyd, I have had the pleasure of hearing Mark Padmore sing the lead role in Bach's St. John Passion several times this year at the English National Opera (I was singing in the volunteer choir used by the production). He has a very clear voice but it's a bit metalic/forced in its quality. I'm not sure if his vocal production is the most healthy (a bias I've picked up from my voice teacher, not based on my own limited knowledge).
That being said, there are some absolutely lovely tenor arias in the St. John's Passion and I wish I had the vocal equipment to sing them, but that's not going to happen I fear.
Cheers, Ingo
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