My favorite quotes from the article both have to do with lens choices:
"Just how important is that lens quality and camera body to the sharp image? I’ve seen lots of fuzzy images from sharp lenses, but I’ve never seen a sharp image from a fuzzy lens. And for a long, long time, I’ve not seen a fuzzy lens. So when it comes to placing blame for an out-of-focus image, it’s what I like to politely call “pilot error.” With that said, personally, I spend the extra bucks and buy Nikon lenses, and generally, the fastest in a focal length."
"Now, if you feel you need to stop your lens down to capture a sharper image, in my book you should chuck that lens! And if you even need to think about that while shooting, you’ve lost all the love of photography."