Last time I used Tri-X I think was back in 1987. From 1983 to 1987 I was shooting several rolls a day and doing my own developing/printing for press work. I still have a few developed negatives from back then; they look grainy compared to what I do now in PS!
You should just buy a roll and shoot it to see. Like I said, even in 35mm format it's quite fine grained. It's really a new film that share the common name.