A lot.
I reflected on the 15 or so Canon bodies that I’ve purchased since 1994. All performed flawlessly from the time that they were removed from the box until they were given away. All of the people to whom I’ve given Canon bodies are still using them with no problems. These are machines with motors, springs, electronics, etc. that are subject to vibration, impact, dust, water, and the other hazards of modern life.
Let’s be honest with ourselves and ask if there is an American company that could produce anything competitive to the Canon 5D. Keep in mind that Canon makes the CMOS sensor in its own fab. Canon writes the software itself. Canon designs and makes the lenses. An American company is lucky if it can handle a challenge in one domain; everything else needs to be contracted out.
What about Japan? How deep is their technological prowess? If they didn’t have Canon they’d have to supply us with cameras from Nikon, Olympus, Pentax, and Sony.
via Jorn Barger