My brother is almost certainly ISTJ and is a fantastic writer. He's quite well-known in his fields of sports and travel writing. Particularly for a sports writer, he's quite erudite. He comes up with some excellent turns of phrase. The only criticism I'd make is that occasionally he sounds like he's trying a little TOO hard to be witty/erudite/borderline cheesy. But he really is an excellent writer.
He's also written fiction, poetry etc but I don't think those are so much his genres.