I have never thought of this.    As I recall, The New Yorker magazine is said to have one of the most intellectually advanced vocabularies.  However, many of the author's they publish are also   people with radical and unscientific  or illogical ideas.  So for my self,  I would look toward the author of a non-fiction book.

 I will say something on the issue of copying a style, or reading a certain author  to learn.

I think personally that Fiction is one of the worst materials to use for study.

If one chooses to prepare for English Language Tests, or  want to prepare for using English in a career,   all Non-Fiction   publications  would be so much better.

   I think  Non-Fiction  books would be a better source than a New Magazine like Time. But News Magazines, owing to their diverse "sections" like People, Celebrities,  World Affairs,  Science, Arts, Politics,  could be the source for a Modern Vocabulary and a diverse  vocabulary.

    I think  that an easier method of study, which would tend to have a less complicated vocabulary would involve the readings in human history. Some of the odd adjectives   are missing in  histories.

Historical accounts   are  easier to read.

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and so forth