Last week's New Yorker magazine had a good story on Matthew Carter, a renowned type designer. They got all the details right, but one factoid they mentioned stood out like a sore thumb. They said, "Dickens preferred vowels, Thackeray used more consonants". How could that be? They were both writing in English in the same time period. How much personal preference for one letter over another could you express?
So I did an experiment. I downloaded plain text versions of David Copperfield and Vanity Fair from Project Gutenberg. A quick histogram of the letters in each reveals this distribution of frequency of use (for letters more than 1%):
The most significant difference I can see is the i: 7.24% for Dickens and 6.41% for Thackeray. And Thackeray's s, h, and r are more common than Dickens'. But Thackeray used more e's and fewer t's. It's all a wash as far as I can see. Maybe there's a slight truth to it, but enough to make a difference to a type designer? I don't see it.
BTW: every time I have to make a data table on this site, I struggle with it. Some day I'll learn the CSS to do it right.