Off hand, I have to admit that I can't think of any mystery writer as a stylist. The ones that sell well are often former journalists. Their style much resembles the stripped-down, simple newspaper style. It tends to be effective for crime "reporting" and makes it easy for readers to follow the story.
Occasionally, you see a little experimentation, as in Ken Bruen's Jack Taylor series. His poem-like lists of nouns, for example, are usually effective and appropriate to the Irish mood and character. Experimentation is good.
For myself, I have discovered that readers pause with pleasure over the pretty stuff, so perhaps there is room in mysteries for some fancy language.