I'm not so sure, my writing varies depending on what I'm writing and in what situation. People always say my writing is ridiculously neat. We were taking about this in the pub last night actually as I was the main writer for a pub quiz.
You could think would mean I'm like that generally, in some things yes but generally very laid back. I know people who are very self controlled and just so who scrawl.
I think anyone can learn to write in a certain way and environment plays a part, I used to practice a lot to get neat handwriting (English teacher father with the most ridiculously neat handwriting and we used to have handwriting competitions at school) and changed styles a few times.
If I'm writing to write more clearly, say at work eg forms or making notes, It's very rounded and straight on however, if I'm writing more casually, it's more fancy and slanted and loopy. Always write joined up.